[dynamic control] add OpampPolicyProvider for the policy pipeline

[jackshirazi]

Description:

OpampPolicyProvider is one possible input to the telemetry policy pipeline. OpampPolicyProvider (and test) is added in this PR

FilePolicyProvider -----\
HttpPolicyProvider ----- \  
OpampPolicyProvider ----- > PolicyStore --> PolicyImplementers
CustomProvider ----/

Support for changing the OpAMP polling interval is included for a policy to be added in the future that let's that value be changed dynamically

Existing Issue(s):

#2546

Testing:

added

Documentation:

Added in the class

Outstanding items:

wiring up the policy pipeline, PRs to come

[Copilot]

Pull request overview

Adds an OpAMP-backed PolicyProvider implementation to the dynamic-control telemetry policy pipeline, enabling policies to be sourced from OpAMP remote config (with a configurable polling interval hook for future dynamic updates).

Changes:

• Added OpampPolicyProvider to subscribe to OpAMP remote config, parse payloads into TelemetryPolicy instances, and publish updates.
• Added unit tests covering endpoint/service identity helpers and polling interval reset behavior.
• Added opamp-client and OkHttp dependencies to the dynamic-control module.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/OpampPolicyProvider.java	New OpAMP-based policy provider with polling, parsing, mapping, validation, and update callbacks.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/OpampPolicyProviderTest.java	Unit tests for endpoint normalization, service identity resolution, and polling interval reset.
dynamic-control/build.gradle.kts	Adds dependencies required by the OpAMP policy provider.