SCM - input box value provider rendering (#198923)

* Initial implementation

* Remove debug messages

* Implementation using a custom ActionViewItem

* Switched to using a custom action along with the custom action view item

* Switch to using arrays

* Refactored code (single provider is working)

* Add ActionRunner to options

* WIP - saving my work

* Refactor things to support one provider

* Add setting to enable/disable input action button

* Add sourceControlId to the proposed API

* Fix issue related to enablement

* Remove code that is not in scope

* Have the old action bar work with the setting

* Remove code that was commented out

* Add extension API changes

* Update extensions/git/src/commitMessageProvider.ts

Co-authored-by: João Moreno <[email protected]>

* Fix compilation errors

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Co-authored-by: João Moreno <[email protected]>