Extract first commit to create new merge request

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To simplify large MRs workflow we could offer an option to extract the first commit from the merge request to create a new merge request out of it. This should make a process of splitting a big MR into smaller ones a little bit easier.

The whole process could look like this:

1. A big MR is created with more than 1 commit.
2. Author decides to split the MR, goes to the Commits page and clicks on the first commit and executes 'Extract into new MR' action. (design TBD)
3. A new smaller MR is created from this commit only (branch name decided during the process), target branch is re-used from the commit source MR.
4. The original MR gets a new HEAD that doesn't have the extracted commit and also has the target branch set to the newly created MR working branch. It also receives the newly created MR as a blocker.
5. The process repeats for the remaining commits (target branches form a chain, new MRs add up to the main MR blockers).
6. (optionally) When the extracted MR gets merged change the target branch for the original MR automatically.