Zoominfo API Authentication Client

The `zoominfo-api-auth-client` package provides an official client for authenticating with the Zoominfo API. It simplifies the process of obtaining access tokens required to interact with Zoominfo's various data services. Currently at version 1.0.1, this library offers two primary authentication flows: PKI (Public Key Infrastructure) using a client ID and private key, and basic authentication using a username and password. Unlike generic HTTP clients, it specifically handles the intricacies of Zoominfo's token generation endpoints, abstracting away the underlying OAuth 2.0 or proprietary authentication mechanisms. Its release cadence is not explicitly stated, but being at a `1.x.x` version, it's expected to be stable. Key differentiators include its direct integration with Zoominfo's specific authentication methods, reducing boilerplate for developers needing to access Zoominfo data without implementing custom authentication logic.