fix: create custom class to verify bitstring position more precisely.

Description:

just fixing and using a custom class now bitstring which is more precisely determining if the revocation is true or false. Earlier was checking that the revocation was not 0 but this is more concrete.

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[ ] My PR follows the contribution guidelines of this project
[ ] My PR is free of third-party dependencies that don't comply with the Allowlist
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hyperledger / identus-edge-agent-sdk-ts

fix: create custom class to verify bitstring position more precisely. #234

Description:

Checklist:

JUnit