Store keybindings properly in keymaps.json and improve conflict checking

[slhultgren]

Fixes issue #9087
Fixes issue #9094

What it does

• Make sure that we only store API relevant information in the keymaps.json to avoid issues when re-creating the bindings from the keymaps.json keybindings: ctrl+k, ctrl+p does not work after rebinding 2 other shortcuts #9087 Consecutive keybindings for same command do not properly overwrite to JSON file  #9094
• Make sure disablements for keymappings are only stored once in keymaps.json. Consecutive keybindings for same command do not properly overwrite to JSON file  #9094
• Only check conflicting keybindings against usable keybindings. Consecutive keybindings for same command do not properly overwrite to JSON file  #9094

Contributed by STMicroelectronics

How to test

Change some shortcuts (at least 2), observe that no "resolved" properties are stored in the keymaps.
Also, follow steps in #9094.

For example, without this patch keymaps.json might contain:

  {
    "command": "textEditor.commands.go.lastEdit",
    "keybinding": "ctrl+alt+left",
    "resolved": [
      {
        "key": {
          "code": "ArrowLeft",
          "keyCode": 37,
          "easyString": "left"
        },
        "ctrl": true,
        "shift": false,
        "alt": true,
        "meta": false
      }
    ],
    "scope": 1
  },

With this patch, keymaps.json will contain instead:

  {
    "command": "textEditor.commands.go.lastEdit",
    "keybinding": "ctrl+alt+left"
  },

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

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[kittaakos]

I have verified it; it works as expected. Thank you so much for your help, @slhultgren 👍

[kittaakos]

keybingings -> keybindings

[slhultgren]

Thanks for the review, I amended the commit and fixed the typo :)

[kittaakos]

I consider the root INFO Navigator root INFO 1) "before each" hook for "copy file" test failure unrelated to this PR and merge the changes. Thank you for the fixes, @slhultgren 👍