Adds support for ChatGPT, DALLE 2 image generations, and the moderation endpoint

What's Changed

• Add Image API (DALL-E) based on the project's structure. by @stonelv in #50
• Image API: Fix image api naming and make some properties type-safe by @OkGoDoIt in #65
• Add Moderations Endpoint by @megalon in #55
• Feature/moderations by @OkGoDoIt in #66
• Add Chat endpoint by @megalon in #56
• Chat endpoint improvements, tests, readme updates, etc by @OkGoDoIt in #67
• Implement Interfaces for endpoint and api classes by @pandapknaepel in #57
• Remove redundant character in azure endpoint by @quangsi28 in #51

New Contributors

• @quangsi28 made their first contribution in #51
• @stonelv made their first contribution in #50
• @megalon made their first contribution in #55
• @pandapknaepel made their first contribution in #57

Full Changelog: v1.5...v1.6