Tracking: PBS-Java parity for first-class TMP support

[bokelley]

This tracks PBS-Java parity for the TMP RFC posted in prebid/prebid-server: prebid/prebid-server#4845

The intended v1 shape is:

• Equivalent external behavior and account/module configuration to PBS-Go.
• Native Java TMP client/module implementation from shared TMP schema and conformance fixtures.
• Same default failure behavior: tight timeout budget and fail-open on router/provider errors.
• Same privacy behavior: context and identity match requests remain separated; publisher/PBS joins results locally.
• Same initial targeting contract: stable adcp_pkg output only.
• Same observability expectations for enabled/disabled, skip reasons, provider errors, timeouts, and activated package counts.

This issue should stay linked to the PBS-Go design thread so TMP is not treated as a later port after behavior has already been settled.