feat: introduce clickhouse db init script

[wrn14897]

Ref: HDX-1777

This shouldn't have any impact on users

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Name	Status	Preview	Comments	Updated (UTC)
hyperdx-v2-oss-app	❌ Failed (Inspect)			May 23, 2025 4:54pm

[dhable]

Pretty sure these statements will fail if the user has started running the OTEL collector against the target DB. The exporter creates the initial schema if one doesn't exist.

I think we need to add IF NOT EXISTS to these create statements. We probably also need to have a corresponding ALTER TABLE IF EXISTS block for each of these tables as well.

[wrn14897]

This is likely fine since the script is called only once before the service starts. But I agree its still safer to add the IF NOT EXISTS guard