make the unused imports script check support multiline formatted imports

[AmadiMichael]

make the unused imports script check support multiline formatted imports, remove unused imports

The types.sol file included in the excluded files array is done since it imports useful types from LibUDT.sol which it does not use and other contract files import them from Types.sol and not LibUDT.sol.

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.

Project coverage is 47.19%. Comparing base (7a293b6) to head (13bdfd4).
Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
...acts-bedrock/scripts/checks/unused-imports/main.go	9.09%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #13695      +/-   ##
===========================================
- Coverage    47.23%   47.19%   -0.04%     
===========================================
  Files          953      953              
  Lines        79700    79709       +9     
  Branches       766      766              
===========================================
- Hits         37644    37620      -24     
+ Misses       39211    39209       -2     
- Partials      2845     2880      +35     

Flag	Coverage Δ
cannon-go-tests-32	62.26% <ø> (-1.98%)	⬇️
cannon-go-tests-64	57.35% <ø> (-1.62%)	⬇️
contracts-bedrock-tests	90.49% <ø> (+2.59%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...es/contracts-bedrock/src/cannon/PreimageOracle.sol	75.91% <ø> (ø)
...acts-bedrock/scripts/checks/unused-imports/main.go	40.90% <9.09%> (-4.71%)	⬇️

... and 33 files with indirect coverage changes