Add code coverage for contracts

[larryob]

Closes ALP-2272

[linear]

ALP-2272 Add test coverage

See forge coverage --help

[github-actions]

LCOV of commit 431f340 during Smart Contracts PR Workflow #500

Summary coverage rate:
  lines......: 29.5% (750 of 2543 lines)
  functions..: 32.2% (158 of 491 functions)
  branches...: 29.2% (184 of 630 branches)

Files changed coverage rate: n/a

[larryob]

@nodimdim This coverage is lower than the true number because we include internal libraries (like solmate's SafeTransferLib), test files, testnet contracts under src/testnet, and external contracts that we inherit from.

[github-actions]

LCOV of commit 91d59b2 during Smart Contracts PR Workflow #503

Summary coverage rate:
  lines......: 29.8% (765 of 2570 lines)
  functions..: 32.2% (158 of 491 functions)
  branches...: 29.2% (184 of 630 branches)

Files changed coverage rate: n/a

[nodimdim]

LGTM, Can we somehow ignore the contracts that we don't use?

[larryob]

@nodimdim Adding node_modules to libs in foundry.toml helped! There's still no way to filter out the contracts under src/testnet or the utils under src/test though.

[github-actions]

LCOV of commit 352c851 during Smart Contracts PR Workflow #507

Summary coverage rate:
  lines......: 77.4% (687 of 888 lines)
  functions..: 62.9% (132 of 210 functions)
  branches...: 67.9% (167 of 246 branches)

Files changed coverage rate: n/a