Dynamic completion

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Description

Complete plugin ids at any position in the command line via Alt-Shift-A and ices via Alt-Shift-C. Both keys are unbound by default, and can be customized via two zstyles, e.g.:

zstyle ":zinit:action-complete:plugin-id" key '^f'
zstyle ":zinit:action-complete:ice" key '^a'

Motivation and Context

Current normal completion doesn't work with for-syntax – it'll not complete plugin id for, e.g.:

zi for zdh<TAB>

While the new, action-complete, will work at any position.

Related Issue(s)

Closes #331.

Usage examples

zi for june/<Alt-A> →zi  for junegunn/fzf

See: https://asciinema.org/a/3bzyTIEXN4iNiDLyRAARcDypt

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

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I've also added a description to README.

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Could the PR be merged?

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Could the PR be merged?

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I've cleanup the PR (squash and 'feat:" prefix), could it be merged?

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Is there any obstacle to merge the commit? It's an isolated change – active at prompt, live – it cannot break anything…

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@vladdoster @pschmitt @jankatins ping

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@vladdoster Could the PR be merged as an Xmas gift? A mention of this could be added to README.md.

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@vladdoster @pschmitt @jankatins ping for merging this PR, presentation:

https://asciinema.org/a/547978