feat(indexer): Allow user to supply rest KV url on the CLI

[tomxey]

Description of change

Allow user to supply rest KV url on the CLI, like: --rest-kv-url=http://example.com/restkv/

Links to any relevant issues

fixes #9456

How the change has been tested

Describe the tests that you ran to verify your changes.

Make sure to provide instructions for the maintainer as well as any relevant configurations.

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)

Infrastructure QA (only required for crates that are maintained by @iotaledger/infrastructure)

• Synchronization of the indexer from genesis for a network including migration objects.
• Restart of indexer synchronization locally without resetting the database.
• Restart of indexer synchronization on a production-like database.
• Deployment of services using Docker.
• Verification of API backward compatibility.

skipping QA as we will do it later when the functionality will be ready on the feature branch

Release Notes

• Indexer: New CLI argument added: --rest-kv-url that can be used to configure Rest KV service, which can be used by the Indexer for fallback in case user queries for data that is already pruned

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6 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
apps-backend	Ignored			Dec 3, 2025 0:47am
apps-ui-kit	Ignored			Dec 3, 2025 0:47am
iota-evm-bridge	Ignored			Dec 3, 2025 0:47am
iota-multisig-toolkit	Ignored			Dec 3, 2025 0:47am
rebased-explorer	Ignored			Dec 3, 2025 0:47am
wallet-dashboard	Ignored			Dec 3, 2025 0:47am