New rest client for Confidential Ledger @azure-rest/confidential-ledger.
Changes in @azure/core-auth:
* Added new CertificateCredential for client cert authentication
Changes in @azure/core-rest-pipeline:
* Expose Agent Secure Context options to set CA, Cert, and Key in an Agent
Changes in @azure-res/core-client:
* Expose the pipeline as part of the client to allow pipeline customization