opentelemetry-sdk: add support for file exporter with declarative config

[herin049]

Description

Add support for the newly added OTLP JSON File exporter to declarative config.

Refs #3631

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

uv run tox -e py314-test-opentelemetry-sdk

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[Copilot]

Pull request overview

This PR extends the opentelemetry-sdk declarative configuration pipeline to support the experimental OTLP JSON Lines file exporter for traces, metrics, and logs by wiring new factory functions into the existing exporter registries and adding output_stream parsing/validation.

Changes:

• Add otlp_file_development exporter factories for spans, metrics, and logs (with helpful “missing package” ConfigurationErrors).
• Introduce _parse_otlp_file_output_stream() and corresponding unit tests for stdout, file://... URIs, and invalid schemes/inputs.
• Add changelog entry for the new declarative-config capability.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
opentelemetry-sdk/src/opentelemetry/sdk/_configuration/_common.py	Adds output_stream parsing helper used by file exporters.
opentelemetry-sdk/src/opentelemetry/sdk/_configuration/_tracer_provider.py	Registers and constructs OTLP JSON file span exporter via declarative config.
opentelemetry-sdk/src/opentelemetry/sdk/_configuration/_meter_provider.py	Registers and constructs OTLP JSON file metric exporter via declarative config.
opentelemetry-sdk/src/opentelemetry/sdk/_configuration/_logger_provider.py	Registers and constructs OTLP JSON file log exporter via declarative config.
opentelemetry-sdk/tests/_configuration/test_common.py	Adds tests for _parse_otlp_file_output_stream().
opentelemetry-sdk/tests/_configuration/test_tracer_provider.py	Adds trace pipeline tests for otlp_file_development exporter behavior.
opentelemetry-sdk/tests/_configuration/test_meter_provider.py	Adds metric pipeline tests for otlp_file_development exporter behavior.
opentelemetry-sdk/tests/_configuration/test_logger_provider.py	Adds log pipeline tests for otlp_file_development exporter behavior.
.changelog/5311.added	Changelog entry for the new feature.

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