Calculate differences between IAT and EPOCHSECONDS

[aharriscybr]

Desired Outcome

Delay Conjur & JWT authentication based on delta calculated from iat and EPOCHSECONDS. This will ensure token validity from iat and github runners.

Implemented Changes

In this PR:

Implemented handle_git_jwt - this function decodes and captures iat from issued JWT token from git IDP. With the decoded iat we check local EPOCHSECONDS, calculate a delta:
If there is a delta, delay for the delta in seconds
If there is no delta, authenticate to conjur

Connected Issue/Story

Resolves #[relevant GitHub issue(s), e.g. 76]
#14

CyberArk internal issue ID: N/A

Definition of Done

@cyberark/integrations-factory test and review

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
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Behavior

• This PR changes product behavior and has been reviewed by a PO, or
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• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[bnasslahsen]

@itsbrugu,

Could you please let us know, if this PR is ok, or we are expecting any other actions ?