Include Beam version details in MongoDB handshake

[NoahStapp]

The PR incorporates MongoDB's wrapping client library specification for the connection handshake to allow library details to be included in the metadata written to mongos or mongod logs.

For example, this change would allow server-side logs such as the following:

{
"t":{"$date":"2025-01-27T23:10:40.108Z"},"s":"I","c":"NETWORK","id":51800,"ctx":"conn16235","msg":"client metadata","attr":{"remote":"127.0.0.1:1094","client":"conn16235",
"doc":{"driver":{"name":"python|Apache Beam","version":"4.15.0|BEAM_VERSION"},"platform":"Python 3.13.7",
"os":{"name":"linux","architecture":"x64","version":"5.15.133+","type":"Linux"}}}
}

For anyone hosting clusters with connections coming from different applications this can help differentiate connections and facilitate log analysis.

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[gemini-code-assist]

Summary of Changes

Hello @NoahStapp, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the MongoDB integration by incorporating the official wrapping client library specification. The primary goal is to enrich MongoDB server logs with detailed information about the connecting Apache Beam client, specifically its version. This provides greater visibility into the origin of database connections, which is crucial for debugging, monitoring, and managing clusters that receive traffic from various applications.

Highlights

• MongoDB Handshake Enhancement: Implemented MongoDB's wrapping client library specification to include client library details during the connection handshake.
• Apache Beam Version Logging: The Apache Beam version is now included in the metadata sent to MongoDB, allowing it to appear in server-side logs.
• Improved Log Analysis: This change facilitates better differentiation and analysis of connections originating from Apache Beam applications in MongoDB server logs.

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[Abacn]

Upon merging realize actually this is a no-op and won't work as intended. self.client is just an hanging member