Support Meter.TelemetrySchemaUrl in SDK, Exporter.InMemory and Exporter.Console

[Kielek]

Towards: #6164
Console Exporter PR for Acitivities: #6713

Changes

Support Meter.TelemetrySchemaUrl in SDK, Exporter.InMEmory and Exporter.Console.

Console Exporter output:

Metric Name: counter, Description: A count of things, Unit: things, Metric Type: LongSum
Instrumentation scope (Meter):
        Name: TestMeter
        Version: 1.0
        Schema URL: https://opentelemetry.io/schemas/1.0.0
        Tags:
                MeterTagKey: MeterTagValue
(2025-11-24T06:33:21.7466571Z, 2025-11-24T06:33:23.7336518Z]  
Value: 40
(2025-11-24T06:33:21.7466571Z, 2025-11-24T06:33:23.7336518Z] tag1: value1
Value: 800
(2025-11-24T06:33:21.7466571Z, 2025-11-24T06:33:23.7336518Z] tag1: value2 tag2: value2
Value: 1600
Resource associated with Metrics:
        service.name: myservice
        service.instance.id: 82dc1510-a87b-407b-af89-0de901c8bedc
        telemetry.sdk.name: opentelemetry
        telemetry.sdk.language: dotnet
        telemetry.sdk.version: 1.14.1-alpha.0.24

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.77%. Comparing base (c2095be) to head (fd3c48f).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...elemetry.Exporter.Console/ConsoleMetricExporter.cs	0.00%	2 Missing ⚠️
...emetry.Exporter.Console/ConsoleActivityExporter.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6714   +/-   ##
=======================================
  Coverage   86.77%   86.77%           
=======================================
  Files         258      258           
  Lines       11975    11984    +9     
=======================================
+ Hits        10391    10399    +8     
- Misses       1584     1585    +1     

Flag	Coverage Δ
unittests-Project-Experimental	86.74% <70.00%> (+0.05%)	⬆️
unittests-Project-Stable	86.70% <70.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../OpenTelemetry.Exporter.InMemory/MetricSnapshot.cs	100.00% <100.00%> (ø)
src/OpenTelemetry/Metrics/Metric.cs	98.63% <100.00%> (+<0.01%)	⬆️
src/OpenTelemetry/Metrics/MetricStreamIdentity.cs	89.68% <100.00%> (+0.42%)	⬆️
...emetry.Exporter.Console/ConsoleActivityExporter.cs	47.05% <0.00%> (ø)
...elemetry.Exporter.Console/ConsoleMetricExporter.cs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes