We need to cache access tokens

[larf311]

We went over our quota on machine to machine (client credentials) authentication requests. We need to ensure we cache the access token and only re-request it when it expires.

[NRHelmi]

All rai sdks support access token caching:

• julia sdk
• golang sdk
• csharp sdk
• javascript sdk
• python sdk
• java sdk

Golang sdk caches access token on disk ~/.rai/tokens.json so this should solve the issue for the cli.

@larf311 I would appreciate a second eye on this, otherwise we could close this issue 🙏

[billscheidel-rai]

Note: This issue has been migrated to https://relationalai.atlassian.net/browse/RAI-4034.

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