docs: google analytics tag

[lukegalbraithrussell]

Adds Google Analytics tag

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.98%. Comparing base (fdbe39f) to head (6c3281e).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1344   +/-   ##
=========================================
  Coverage     74.98%   74.98%           
  Complexity     4189     4189           
=========================================
  Files           451      451           
  Lines         12930    12930           
  Branches       1331     1331           
=========================================
  Hits           9696     9696           
  Misses         2463     2463           
  Partials        771      771           

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