Add RepositoryFilesystem

[mcmire]

When linting a project, we need to constantly read the files within either the module template or the project. We want this tool to run as fast as possible, and to do this, we can cache the metadata and content of each file that we read so that we don't have to do it again. This class assists with that.

Related to #5.

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See here for context on how a RepositoryFilesystem will eventually be used:

• https://github.com/MetaMask/module-lint/blob/add-initial-code/src/rules/require-source-directory.ts#L10
• https://github.com/MetaMask/module-lint/blob/add-initial-code/src/establish-metamask-repository.ts#L89

[socket-security[bot]]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Packages	Version	New capabilities	Transitives	Size	Publisher
@metamask/utils	8.2.0	filesystem	+17	4.96 MB	metamaskbot

[mcmire]

^ Addressed merge conflicts.