Add access token introspection to avoid new access token fetch if feasible #50
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Description of change
LinkedIn seemingly does not appreciate when we fetch new access tokens while a valid one already exists. This has been observed to exhibit itself in the form of 429 errors suggesting that a user has reached a rate limit while trying to use a refresh token to fetch a new access token in discovery.
This change checks the expiration of an existing access_token (if one is present in the config) and proceeds with that token if so.
Manual QA steps
Risks
Rollback steps