Added new routes for OIDC functionality

[telday]

Desired Outcome

Bring the OpenAPI spec up to date with updates to the OIDC authenticator for the Conjur UI MFA feature.

Implemented Changes

Added two additional endpoints to the authenticators tag, one which allows retrieval of a list of all available OIDC authenticators (ListOIDCAuthenticators) and one which provides details on a single authenticator (GetOIDCProviderInfo).

Connected Issue/Story

CyberArk internal issue link: ONYX-20982

Related Conjur PR

Definition of Done

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
• A follow-up issue to update official docs has been filed here: insert issue ID
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• 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

[szh]

@telday is this PR still relevant?