feat: port maybeRedeemCredits() from get-api-key.tsx to login_with_chatgpt.py

[bolinfest]

This builds on #1212 and ports the maybeRedeemCredits() function from get-api-key.ts to login_with_chatgpt.py:

codex/codex-cli/src/utils/get-api-key.tsx

Lines 84 to 89 in a80240c

	async function maybeRedeemCredits(
	issuer: string,
	clientId: string,
	refreshToken: string,
	idToken?: string,
	): Promise<void> {