Offer shortcut commands to commonly invoked code actions

Offer shortcut commands to commonly invoked code actions

See also https://github.com/joaotavora/eglot/issues/598.

Make eglot-code-actions accept a new action-kind argument.  If there
is only one action of that kind, apply it.  This allows us to create
actions shortcuts like eglot-code-action-organize-imports, etc.

* eglot.el (eglot-code-actions): Accept new argument action-kind.
(eglot--code-action): New function-defining helper macro.
(eglot-code-action-organize-imports)
(eglot-code-action-extract)
(eglot-code-action-inline)
(eglot-code-action-rewrite)
(eglot-code-action-quickfix): New commands.

* README.md: Mention new feature.

* NEWS.md: Mention new feature.

Co-authored-by: João Távora <joaotavora@gmail.com>
GitHub-reference: close https://github.com/joaotavora/eglot/issues/411