[RFR] Migrate ra-core actions to Typescript

[ghost]

Migrate the files in the action folder of the ra-core package to Typescript

[fzaninotto]

Encouraging!

Please don't commit the yarn.lock, iy shouldn't change in this PR.

[fzaninotto]

For the metas, we need to be a bit smarter. As each meta has a special signification (and triggers a particular side effect), we probably need a subtype for accumulate, to be reused everywhere the accumulate meta is present.

[fzaninotto]

Switching to RFR. All actions and reducers aren't merged, but nothing is blocking the merge and we'll continue little by little.

[djhi]

Nice :)

[fzaninotto]

oh, wait, back to WIP, I wanted to see if I can improve the diff to show renames instead of deletion / addition.

[fzaninotto]

There is no way to tell git that it's a rename when its internal heuristics don't detect it. So back to RFR.

[ghost]

Looks good to me, there might be a lot of any used for the actions payload. I don't know if we can be more precise on these types.