feat: additional environment options

[trs]

These options are used in the underlying chargebee-typescript library to build the request. We can expose them as override options if we need to direct the request elsewhere.

References:

• https://github.com/chargebee/chargebee-typescript/blob/master/src/chargebee.ts#L71C18-L71C18
  • Options are extended into this._env
• https://github.com/chargebee/chargebee-typescript/blob/master/src/core.ts#L84
  • Options (_env) being used
• https://github.com/chargebee/chargebee-typescript/blob/master/src/environment.ts#L4
  • Reference of other options

[github-actions]

🎉 This PR is included in version 1.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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