Add syntactic sugar for wrapping operations with a span

[fractalwrench]

Goal

Adds syntactic sugar to make it easier for library consumers to wrap operations with a Span. This works by providing a higher-order function that ends the span after its execution is ended.

This has the added bonus of:

1. Requiring a status to be set when ending the span
2. Automatically recording exceptions as events when they happen in the operation
3. Automatically setting the status to Error if the operation throws an exception

Originally the approach suggested AutoCloseable but I feel this approach is preferable given that it's now in an opt-in module of syntactic enhancements.

Closes #4

Testing

Added unit tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.61%. Comparing base (d1dfece) to head (60ff6a7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   90.60%   90.61%   +0.01%     
==========================================
  Files         215      215              
  Lines        2298     2302       +4     
  Branches      233      233              
==========================================
+ Hits         2082     2086       +4     
  Misses        163      163              
  Partials       53       53              

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[bidetofevil]

LGTM with a comment about whether we need to fail a span if we are auto-closing due to an exception/error.

Also added a comment about adding a test that verifies thrown exceptions/errors still lead to the span being closed

[fractalwrench]

There's some discussion on #4 about how opentelemetry-java decided against AutoCloseable due to the syntax making it trickier to set the status when a span completes. I'll hold off merging until the discussion has a path forward.

Review is stale as I've changed approach to use an extension function instead.

[fractalwrench]

Based on discussion in #4 I've tweaked this changeset to use an extension function instead of AutoCloseable.

[bidetofevil]

Nice. LGTM.