Prepare for 2.1.0 release

[Matus Tomlein (matus-tomlein)]

Release prep for 2.1.0.

Bumps the version label, README GIT_TAG and release badge, and adds the CHANGELOG entry — following the same pattern as previous Prepare for X.Y.Z release commits.

Files changed

• include/snowplow/constants.hpp — SNOWPLOW_TRACKER_VERSION_LABEL: cpp-2.0.0 → cpp-2.1.0
• README.md — GIT_TAG and release badge → 2.1.0
• CHANGELOG — new Version 2.1.0 (2026-07-23) entry

CHANGELOG (2.1.0)

• Resolve idle-sleep and flush-timeout shutdown hangs in the emitter, and add a configurable flush timeout (fix(emitter): resolve idle-sleep and flush-timeout shutdown hangs #100)
• Restore build & Install workflows and stabilize integration tests (fix(ci): restore build & Install workflows and stabilize integration tests #99)
• Ensure database filename used by test is invalid with SQLite >= 3.39.0 (Fix SQLite storage test for SQLite >= 3.39.0 #94)
• Add delays to integration tests before checking received events in Micro to allow for async processing and disable cookie test on mac
• Fix documentation build using Doxygen

Minor bump: #100 adds a new public API (EmitterConfiguration::set_flush_timeout_ms) alongside the shutdown-hang fixes.

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