feat(tracing): Add WithDescription SpanOption

[natikgadzhi]

Summary

This pull request adds WithDescription span option! Closes #739, thank you to @moneymikeMD for the issue.

Changes

• Disclaimer: I was just diving into the go SDK codebase, and was looking through the issue list for an easy way in. Please feel free to tell me to gtfo if that pull request is not all that useful.
• I've added the WithDescription SpanOption that works similar to the existing WithTransactionName and friends.

TODO

• Unit tests into tracing_test.go. Wait a sec, will do in a couple hours.

/cc @greywolve

[greywolve]

@natikgadzhi thanks for the PR! Just need to fix a linting issue and this should be good. :)

[natikgadzhi]

@greywolve I do have to admit, not setting up a formatter in a Go project is kind of embarrasing. Fixed!

[greywolve]

@greywolve I do have to admit, not setting up a formatter in a Go project is kind of embarrasing. Fixed!

Haha no problem, I forget this sometimes too :)

[natikgadzhi]

Btw, perhaps worth setting up a .vscode/settings.json with custom formatter path to ensure gofmt -s by default?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (032ecc1) 80.77% compared to head (3cde419) 80.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #751      +/-   ##
==========================================
+ Coverage   80.77%   80.88%   +0.11%     
==========================================
  Files          47       48       +1     
  Lines        4701     4714      +13     
==========================================
+ Hits         3797     3813      +16     
+ Misses        765      763       -2     
+ Partials      139      138       -1     

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[greywolve]

Btw, perhaps worth setting up a .vscode/settings.json with custom formatter path to ensure gofmt -s by default?

Not sure everyone uses vscode, but that could be useful for sure.