Updating with logic for expire token

[jboucourt]

Summary

There are issues when vault token expires mainly for jobs running in temporal. We are updating the lib to check when the token is about to expire and proactively reconnect to obtain a new token. New tokens have a ttl of 32 days, our logic is to reconnect 5 days before expire time.

Testing

Check one of the following boxes once you've 1) completed testing and added a description of the test below or 2) added a description for why testing isn't needed.

• This change has been tested and a description of the test(s) performed has been added in accordance with Clear Street's testing policy.
• Testing has not been performed and a description of why has been added.

Description of Testing:

I have tested locally, creating a policy on vault and executing the logic.

How-to Updating gestalt: https://www.notion.so/clearstreet/Updating-Gestalt-7b09f58cdf4c4344a28b5e059d1dc222