Ensures view node parent overrides

Refs: #2680

- Adds ai.experimental.provider setting to switch between OpenAI & Anthropic

- Moves AI settings into a new AI section
 - Renames new setting into a `gitlens.ai` namespace and changes it to be an enum for easier selection
 - Updates max characters to be dependent on selected model

Refs: #2680

Refs #2677

- adds color to push and pull actions
- shows fetch action always

- Consolidates Open on Remote commands into "Open on Remote (Web)" submenu
 - Enables "Open on Remote (Web)" submenu by default
 - More ordering refinements

- Adds share menu to SCM items
 - Consolidates all file history commands into a "File History" submenu
   - Adds Visual File History option
 - Renames "Commit Changes" submenu to "Open Changes"
 - Enables annotations & history submenus on `editor/context` by default
 - Disables Open on Remote on `editor/title/context` & `explorer/context` by default
 - Reorders many items

* Allows hiding graph, ref, message columns
* Updates graph dependency
* Reorders column menus to be alphabetical

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Co-authored-by: Eric Amodio <eamodio@gmail.com>

Renames Delete Stash to Drop Stash