[KeyboardManager] Added option for exact match shortcut

[mantaionut]

Summary of the Pull Request

Added option for exact match for a shortcut. If exact match is checked then the shortcut will only be replaced if no other keys are also pressed.

PR Checklist

• Closes: Mapping Alt+Left to MediaNext also remaps all other meta-key combinations #10961
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

The exact match key is in the select keys window below the Allow Chords checkbox.
I also removed ShortcutSecondKeyOfChordSettingName from begin saved and loaded in json since its redundant since secondKey is already set in SetKeyCodes in constructor.

Validation Steps Performed

1. Open Keyboard Manager
2. Create a shortcut and set it to exact match
3. Check that the shortcut only gets triggered if no other keys are pressed.

[crutkas]

@mantaionut you have to accept the CLA

[mantaionut]

@microsoft-github-policy-service agree company="Microsoft"