Support for Chroma Cloud authentication

[timo-cingoez]

Adds support for Chroma Cloud authentication via the X-CHROMA-TOKEN header.

Usage

ChromaDB::factory()
    ->withHost('https://api.trychroma.com')
    ->withPort(443)
    ->withChromaApiKey('your-api-key')
    ->connect();

[CodeWithKyrian]

Closed in favor of #16

I’m going to close this one since #16 already covers the Cloud authentication use-case through withHeader support for arbitrary headers, along with a dedicated Chroma::cloud() factory for simpler instantiation.

Really appreciate the time you took to open this PR 🙏🏽