Review all proposed terminal APIs

[Tyriar]

They're stacking up, let's try push some forward as some new ones are coming in for August.

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Checked ones are reviewed/have next steps.

• EnvironmentVariableCollection
  • 🏃 vscode.proposed.envCollectionOptions.d.ts Allow EnvironmentVariableCollection API to apply changes via shell integration #179476
    • Ready for finalization after decision on applyAtProcessCreation
    • We will treat undefined as false for all members and finalize
  • ➡️ vscode.proposed.envCollectionWorkspace.d.ts Allow specifying workspace-specific EnvironmentVariableCollection mutators #171173
    • @karrtikr owns, planned for this iteration
  • 🏃 promptPrefix Allow specifying prompt prefix via Environment variable collection #188969
    • Still unclear what we want to do here, bring to UX sync
• env
  • 🏃 vscode.proposed.envShellEvent.d.ts vscode.env.shell might return empty string to extension if fetched very soon after startup #160694
    • The Python extension wants to use this one
    • Ready for finalization after decision on whether to resolve profiles before exthost launch
    • Brought to API sync 8/8, bring to 15/8
• Terminal
  • ✋ vscode.proposed.terminalDataWriteEvent.d.ts API: onDidWriteTerminalData event #78502
    • Frozen in proposed, updated comments
  • ✋ vscode.proposed.terminalDimensions.d.ts API to retrieve a dimensions from a given Terminal instance #55718
    • Was for Live Share but has problems (Allow extensions control dimensions for existing terminals #79246), not enough time to look into this considering its priority
  • 🏃 vscode.proposed.terminalQuickFixProvider.d.ts Terminal quick fix API #162950
    • Not ready for finalization, updated proposal to have a vscode command callback

New APIs for Copilot

• Terminal
  • 🏃 vscode.proposed.terminalSelection.d.ts Add an API to get a terminal's selection #188173
    • Updated proposal
    • Brought to API sync 8/8, bring to 15/8
  • 🏃 Terminal context menu Ability to contribute context menu entries for Terminal #79034
    • Contribution only
    • Updated proposal, approved in API sync before but additions were made
    • New additions look good, going ahead with it
  • 🏃 Expose shell integration command knowledge to extensions Expose shell integration command knowledge to extensions #145234
    • Updated proposal, discuss before implementing as it's complex
    • Have some early feedback, iterate before bringing to API sync again

[Tyriar]

Above is a summary of the current state, all APIs we're moving forward on are now tracked in the milestone/project