Implement Data Caching for Monorepos

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Feature description

In monorepos with multiple changelogs, git-cliff needs to request data from GitHub for each one. I would like to see a caching feature added so that git-cliff can skip the repeated requests.

Desired solution

Add an enable_cache flag to the cliff.toml and a --cache flag. If provided, git-cliff will store the results of any API requests in a .git-cliff cache folder. When the option is enabled, git-cliff will look at the latest commit in the target brach to decide if the cache should be invalidated.

Alternatives considered

Using --context and --from-context. But pre-processors are already applied to the context, leaving them invalid for changelogs with different pre-processors, tag-filters, etc.

Additional context

No response