feat: Attach server.address to metrics

[alexander-alderman-webb]

Description

Set the server.address attribute on metrics analogously to logs.

Issues

See https://linear.app/getsentry/issue/SDK-60/attach-serveraddress-as-a-default-attribute-to-metrics.

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.02%. Comparing base (c4d0ba8) to head (3148c74).
⚠️ Report is 3 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
sentry_sdk/client.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5113       +/-   ##
===========================================
+ Coverage   70.26%   84.02%   +13.75%     
===========================================
  Files         180      180               
  Lines       18023    18029        +6     
  Branches     3205     3208        +3     
===========================================
+ Hits        12664    15148     +2484     
+ Misses       4672     1905     -2767     
- Partials      687      976      +289     

Files with missing lines	Coverage Δ
sentry_sdk/client.py	83.71% <66.66%> (+1.04%)	⬆️

... and 56 files with indirect coverage changes