feat(copy): adds copier template

[Matt-Carre]

Adds a copier template.

Requires you to:
make a new directory
open new_directory_path
git init in that directory
git remote add origin {origin ssh}
git branch -M main

cd ..
then either:

git clone this repo
copier copy {this_repo's_path} {new_directory_path}
or:
copier copy git@github.com:DiamondLightSource/python-copier-template.git {new directory path}
rebuild in dev container without cache

Upon a rebase (i.e., once my other two PRs are merged), we will need to move the new things into the copy template folder and update accordingly.

Furthermore, I've added a #type:ignore in the copier init.py portion because pydantic was complaining.

Also - a lot of the changed files here are me copying over files from e.g. the .github folder, so are probably not worth looking at when you guys come to review it just so you're aware :) - because 3198 lines is a LOT

my copied version is here:
https://github.com/Matt-Carre/copy-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b0bb15c) to head (babf18d).

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           22        22           
=========================================
  Hits            22        22           

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