feat: add geyser plugin safe-start checks

[thlorenz]

Summary

Adds safe-start startup checks for the geyser plugin so validator/plugin startup fails early with actionable errors instead of continuing into harder-to-debug runtime failures.

Details

geyser-plugin

• Adds startup preflight checks during plugin load for validator wrapper config, runtime TOML config, ksqlDB restore setup, Kafka readiness, admin bind availability, and local RPC URL syntax.
• Improves startup and backfill error messages so failures include the failing component, config field/value context where useful, and a suggested action.
• Centralizes config validation helpers, including ksql identifier validation and wrapper/runtime config path resolution, so the same checks apply across Makefile and direct validator launch paths.
• Adjusts ksql restore flow so startup can prefetch restored pubkeys separately from applying them to subscriptions.
• Makes metrics registration and admin server startup more tolerant of repeated setup paths used by tests/startup validation.
• Documents the safe-start behavior, manual failure matrix, and success/failure proof commands in the geyser plugin README.

grpc-service

• Adds startup delay observability so service readiness timing is easier to diagnose when coordinating validator/plugin integration tests.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3eff92e4-a78a-4d4a-b275-533687d8f33c

📥 Commits

Reviewing files that changed from the base of the PR and between d877d28 and dbf0709.

📒 Files selected for processing (13)

• geyser-plugin/README.md
• geyser-plugin/src/config.rs
• geyser-plugin/src/initial_account_backfill/mod.rs
• geyser-plugin/src/initial_account_backfill/rpc.rs
• geyser-plugin/src/ksql.rs
• geyser-plugin/src/lib.rs
• geyser-plugin/src/metrics.rs
• geyser-plugin/src/plugin/mod.rs
• geyser-plugin/src/preflight.rs
• geyser-plugin/src/server/accounts.rs
• geyser-plugin/src/server/mod.rs
• geyser-plugin/src/server/prom.rs
• grpc-service/src/app.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch validator-safe-start

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[thlorenz]

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