feat: introduce Result Service using Lakekeeper as REST catalog for Iceberg - bootstrap script

[mengw15]

What changes were proposed in this PR?

This is PR 2 of a decomposed series from #4242, adding the Lakekeeper bootstrap script for local development setup.

New files:

• bin/bootstrap-lakekeeper.sh (~525 lines): idempotent script that automates Lakekeeper setup:
  1. Starts Lakekeeper if not already running
  2. Bootstraps the Lakekeeper server (creates default project)
  3. Creates MinIO bucket if needed
  4. Creates the warehouse with S3 storage configuration
• bin/parse-storage-config.py: HOCON config parser utility used by the bootstrap script to read values from
  storage.conf

Post-merge setup for developers:

1. Create the Lakekeeper database:
   psql -f sql/texera_lakekeeper.sql
2. Download the Lakekeeper binary from the Lakekeeper releases page
3. Edit bin/bootstrap-lakekeeper.sh user configuration section:

• LAKEKEEPER_BINARY_PATH — path to the downloaded binary
• LAKEKEEPER__PG_DATABASE_URL_READ/WRITE — PostgreSQL connection URL
  (postgres://user:password@host:5432/texera_lakekeeper)

4. Run the script:
   ./bin/bootstrap-lakekeeper.sh

Any related issues, documentation, discussions?

Part of #4126. Depends on #4272 (catalog migration).

How was this PR tested?

Manually tested

Was this PR authored or co-authored using generative AI tooling?

Co-authored with Claude Code