Part of #33555

Problems
Extensions currently do not know how a code actions request was triggered. Code actions may be requested automatically by vscode or when the user requests them

Proposal
Add a trigger type to CodeActionContext:

export interface CodeActionContext {
    readonly diagnostics: Diagnostic[];
    readonly trigger: 'auto' | 'manual';
}

• auto: Code actions requested by VS Code automatically
• manual: Code actions requested by user / command

Extensions could use this to determine which code actions they want to compute / show. For example, an extension may decide to only compute refactorings when a user requests them

// @jrieken