ts: Add strong type support for addEventListener

[acheroncrypto]

Problem

Program.addEventListener method is not strongly typed.

anchor/ts/packages/anchor/src/program/index.ts

Lines 360 to 363 in cec9946

	public addEventListener(
	eventName: string,
	callback: (event: any, slot: number, signature: string) => void
	): number {

eventName is a string, and event is any.

Summary of Changes

• Add strong type support for addEventListener method. Both eventName and event is now strongly typed.
• Convert and refactor the event tests from JavaScript to TypeScript to test types properly.

[vercel]

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