chore: Cleanup and improvements

[alainncls]

What does this PR do?

• Unifies tests names
• Adds a lot of NatSpec comments on smart contracts
• Eliminates most of the linting warnings

Related ticket

Fixes #94

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[codecov-commenter]

Codecov Report

Merging #222 (c76fb27) into dev (75941ae) will decrease coverage by 0.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #222      +/-   ##
==========================================
- Coverage   95.85%   95.26%   -0.60%     
==========================================
  Files          11       11              
  Lines         169      169              
  Branches       38       38              
==========================================
- Hits          162      161       -1     
- Misses          5        6       +1     
  Partials        2        2              

Files Changed	Coverage Δ
src/AttestationRegistry.sol	97.77% <ø> (ø)
src/ModuleRegistry.sol	95.23% <ø> (ø)
src/PortalRegistry.sol	95.83% <ø> (ø)
src/Router.sol	92.30% <ø> (-7.70%)	⬇️
src/SchemaRegistry.sol	94.44% <ø> (ø)
src/example/EASPortal.sol	92.30% <ø> (ø)
src/example/MsgSenderModule.sol	100.00% <ø> (ø)
src/example/PayableModule.sol	100.00% <ø> (ø)
src/interface/AbstractModule.sol	100.00% <ø> (ø)
src/interface/AbstractPortal.sol	95.23% <ø> (ø)

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