Add a warning if there is a mismatch between the USDK cli version and the Agent's usdk version

[SaadBazaz]

Related to this issue on Discord: https://discord.com/channels/1299433782348091514/1305785928769470495/1306887123395412009

Agents created with older versions of USDK may not work with new versions of the USDK CLI. So we can add a warning upon each usdk invokation on an Agent:

⚠️ Warning: Version mismatch. Your `usdk` CLI version (0.0.92) and Agent's USDK version (0.0.84) do not match. We recommend having the same versions to avoid issues.
Troubleshooting:
Either:
- Downgrade (or upgrade) or `usdk` CLI
- Generate a new Agent with this CLI version

More on this: https://docs.upstreet.ai/migration-guides/previous-versions

[AbdurrehmanSubhani]

Added in the following PR:
#579

Although the warning text is a bit different, do let me know if that requires an update