New pallet template (default)

[tsenovilla]

This is a sub-PR of

• feat: improve pallet template generation #261

Following what @brunopgalvao said here: #261 (comment) I updated the current template to be closer to the one proposed in https://github.com/paritytech/polkadot-sdk/blob/master/templates/parachain/pallets/template but with some small modifications.

This gives pop cli an updated template for the command pop new pallet allowing newcomers to generate a default template full of docs, ideal to start learning about FRAME development.

The main PR is still open and will be used to propose the advanced, dynamic mode for pop new pallet

[AlexD10S]

Looks good! Thanks for contributing to pop-cli.

Closes #260

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 69.53%. Comparing base (b487422) to head (f2b62bf).

Files	Patch %	Lines
crates/pop-parachains/src/generator/pallet.rs	0.00%	0 Missing and 1 partial ⚠️
crates/pop-parachains/src/new_pallet.rs	80.00%	0 Missing and 1 partial ⚠️

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
- Coverage   69.54%   69.53%   -0.02%     
==========================================
  Files          51       51              
  Lines        8341     8344       +3     
  Branches     8341     8344       +3     
==========================================
+ Hits         5801     5802       +1     
  Misses       1591     1591              
- Partials      949      951       +2     

Files	Coverage Δ
crates/pop-parachains/src/generator/pallet.rs	36.36% <0.00%> (-3.64%)	⬇️
crates/pop-parachains/src/new_pallet.rs	76.40% <80.00%> (-0.61%)	⬇️