[chore] prep for chain v1.20.1

[dbrajovic]

Summary by CodeRabbit

• New Features
  • Added API support for preparing fee grants.
  • Added an RPC endpoint for funding payments in derivatives.
• Bug Fixes
  • Refreshed generated protobuf client/server bindings to stay compatible with updated upstream message and service schemas.
• Chores
  • Bumped the package version to v1.16.0 and updated the changelog entry.
  • Advanced upstream dependency revisions used for code generation (including the indexer clone revision).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 451de6f3-f307-4f6c-9183-4e03d1ca31f4

📥 Commits

Reviewing files that changed from the base of the PR and between 95cc7d9 and 72333c8.

📒 Files selected for processing (2)

• CHANGELOG.md
• pyproject.toml

✅ Files skipped from review due to trivial changes (2)

• pyproject.toml
• CHANGELOG.md

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📝 Walkthrough

Walkthrough

The PR updates generation inputs and package versioning, regenerates multiple protobuf descriptors, and adds gRPC bindings for new PrepareFeeGrant and FundingPayments RPCs.

Changes

Generated proto refresh

Layer / File(s)	Summary
Input version updates buf.gen.yaml, Makefile, pyproject.toml	The clone target, buf generation tags, and Poetry version are updated.
PrepareFeeGrant RPC pyinjective/proto/exchange/injective_exchange_rpc_pb2.py, pyinjective/proto/exchange/injective_exchange_rpc_pb2_grpc.py	The Injective Exchange protobuf descriptor adds PrepareFeeGrant message types, and the gRPC module wires the new RPC through the stub, servicer, handler map, and experimental client.
Exchange descriptor refresh pyinjective/proto/exchange/injective_chart_rpc_pb2.py, pyinjective/proto/exchange/injective_rfq_gw_rpc_pb2.py, pyinjective/proto/exchange/injective_rfq_rpc_pb2.py	The chart, RFQ gateway, and RFQ protobuf modules rebuild serialized descriptor bytes and offset metadata.
Peggy descriptor refresh pyinjective/proto/injective/peggy/v1/msgs_pb2.py, pyinjective/proto/injective/peggy/v1/rate_limit_pb2.py	The Peggy message and rate-limit protobuf modules add an oracle import and refresh descriptor bytes and offsets.
FundingPayments RPC pyinjective/proto/exchange/injective_tc_derivatives_rpc_pb2.py, pyinjective/proto/exchange/injective_tc_derivatives_rpc_pb2_grpc.py	The TC derivatives protobuf descriptor and gRPC module add FundingPayments schema updates and client/server bindings.

Sequence Diagram(s)

sequenceDiagram
  participant InjectiveExchangeRPCStub
  participant add_InjectiveExchangeRPCServicer_to_server
  participant InjectiveExchangeRPCServicer
  add_InjectiveExchangeRPCServicer_to_server->>InjectiveExchangeRPCServicer: register PrepareFeeGrant handler
  InjectiveExchangeRPCStub->>InjectiveExchangeRPCServicer: PrepareFeeGrantRequest
  InjectiveExchangeRPCServicer-->>InjectiveExchangeRPCStub: UNIMPLEMENTED

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sequenceDiagram
  participant InjectiveTCDerivativesRPCStub
  participant add_InjectiveTCDerivativesRPCServicer_to_server
  participant InjectiveTCDerivativesRPCServicer
  add_InjectiveTCDerivativesRPCServicer_to_server->>InjectiveTCDerivativesRPCServicer: register FundingPayments handler
  InjectiveTCDerivativesRPCStub->>InjectiveTCDerivativesRPCServicer: FundingPaymentsRequest
  InjectiveTCDerivativesRPCServicer-->>InjectiveTCDerivativesRPCStub: UNIMPLEMENTED

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

Hop-hop, I nibbled proto leaves so bright,
and found new RPC carrots in the light.
Fee grants and fundings now prance in a line,
with tidy bytes that shimmer and shine.
🐰✨

Possibly related PRs

• InjectiveLabs/sdk-python#417: Directly updates the same proto-generation inputs and regeneration surface, making it the closest code-level companion to this descriptor/RPC refresh.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: preparing the SDK for chain v1.20.1.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/prep-for-1.20.1-beta

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