feat: add wiring for telemetry v1

[saishreeeee]

Description:
Adds an opt-in, default-off telemetry subsystem for the Databricks adapter. Enable with enable_dbt_telemetry: true in connection_parameters.

• Two events per eligible invocation (build, run, test, seed, and snapshot only): POST_PARSE contains invocation configuration, manifest resource counts, connection shape, and behavior flags; POST_RUN contains status, termination reason, node and hook result counts, and duration.
• Privacy: no credentials, hostnames, cluster IDs, or object names. Auth is reduced to an enum family, http_path to compute type, and only a non-PII workspace ID is sent.
• Best-effort and async: sends run on a background thread with a 10-second request timeout and never block a SQL connection. Run-end waits up to two request timeouts for queued events. Failures are ignored and never affect the dbt command.

Testing:
(will check whether telemetry logs land in the dbt telemetry table)

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
dbt/adapters/databricks
connections.py					528
handle.py
impl.py					909-910, 913-914
dbt/adapters/databricks/telemetry
__init__.py
builder.py					105, 151-160, 164-169, 173-175, 201-202, 211-218, 227-236, 242-243, 286, 306, 338-340
client.py					16-19, 28-61
config.py					11, 17, 19, 30-31, 41
coordinator.py					106, 125-127, 130-132, 142-143, 152, 162, 168-172, 175-179, 185, 198, 248-253, 297, 306, 309, 341, 395
encoder.py
hooks.py					14-20, 28-34, 44, 49-58, 74-82, 91-109, 113-114, 120-130
listener.py					7-9, 13-18, 34, 37, 49-50, 52, 54, 61-63, 71-79
models.py
Project Total

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