Better support for monorepos

[Meemaw]

In a monorepo one might use multiple actions on a PR to report changes on different modules.

• If using comments, each of those actions will override/"update" the previous comment.
• If using "use-check" the behaviour is wrong as well

Proposed solution:

• Introduce an input that will dedup those comments (e.g. label or something). One could pass label="App 1", label="App2" (this could also be displayed in the final markdown for better UI/UX) which would additionally be used to dedup the comments.

[developit]

Wouldn't it be better to have a single action calculate and size diffs for all files in the monorepo?

[frassinier]

Agreed with @developit,
if you use Lerna, for example, you just have to include all packages using pattern

          pattern: './packages/*/dist/*.{js,css}'

[rschristian]

Support for multiple comments is tracked by #81