Add with_boundaries hint API for explicit bucket histograms

[utpilla]

Related to #1241

Changes

• Add with_boundaries hint API for explicit bucket histograms

Usage

let histogram = meter
        .f64_histogram("my_histogram")
        .with_description("My histogram example description")
+       .with_boundaries(vec![1.0, 2.0, 3.0, 4.0, 5.0])
        .init();

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.0%. Comparing base (b244673) to head (eb81dd3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/metrics/mod.rs	95.0%	2 Missing ⚠️
opentelemetry/src/metrics/instruments/mod.rs	83.3%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2135   +/-   ##
=====================================
  Coverage   78.9%   79.0%           
=====================================
  Files        121     121           
  Lines      20831   20908   +77     
=====================================
+ Hits       16453   16527   +74     
- Misses      4378    4381    +3     

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[cijothomas]

// Setting boundaries is optional. By default, the boundaries are set to
// [0.0, 5.0, 10.0, 25.0, 50.0, 75.0, 100.0, 250.0, 500.0, 750.0, 1000.0, 2500.0, 5000.0, 7500.0, 10000.0]

please copy this wording too.

[cijothomas]

LGTM!
This was probably the last blocker, and now we can upgrade opentelemetry metrics api as beta.

[cijothomas]

Co-incidentally, OTel .NET just did the same feature addition at same time as OTel Rust!
https://github.com/open-telemetry/opentelemetry-dotnet/pull/5854/files