Add support for MongoDB Atlas `$search` operator

[mtrezza]

New Feature / Enhancement Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.

Current Limitation

Parse JS SDK already provides support for the MongoDB $text operator, but not the MongoDB Atlas (hosted MongoDB) specific $search operator, or Atlas Search.

Feature / Enhancement Description

Add support for the MongoDB Atlas $search operator. Note that this operator is a header operator for multiple sub-operators, such as $regex.

Example Use Case

Search with regex using MongoDB Atlas Search.

Alternatives / Workarounds

Using the MongoDB driver directly via the Parse Server database adapter.

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