Fix linting errors in a number of core and tool files (partial)

- As part of this work I also started building out errors.ts which will be a cumulation of error helpers to better handle the challenging `catch (error: unknown)` requirement.
- More changes are to come, this is truly a partial change in order to not disrupt as many people as possible.

Part of https://b.corp.google.com/issues/411384603

packages/cli/src/ui/types.ts

@@ -12,7 +12,7 @@ export interface ToolCallEvent {
   status: ToolCallStatus;
   callId: string;
   name: string;
-  args: Record<string, any>;
+  args: Record<string, never>;
   resultDisplay: ToolResultDisplay | undefined;
   confirmationDetails: ToolCallConfirmationDetails | undefined;
 }