Indexer split connection

[evan-wall-mysten]

Description

This PR splits Connection into

• Connection
  • init_watermark - no longer references reader_lo, defaults to Connection::committer_watermark
  • committer_watermark - same as before
  • set_committer_watermark - same as before
• TrailingConnection
  • trailing_init_watermark - same as previous Connection::init_watermark
  • reader_watermark - same as before
  • pruner_watermark - same as before
  • set_reader_watermark - same as before
  • set_pruner_watermark - same as before

---

Connection impls:

• AnalyticsConnection
• BigTableConnection
• ObjectStoreConnection
• Consistent store Connection

TrailingConnection impls:

• Postgres Connection
• MockConnection

---

TrailingConnection extends Connection because TrailingInitWatermark and ReaderWatermark both reference checkpoint_hi_inclusive.

Connection::init_watermark defaults to Connection::committer_watermark for impls that do not have initialization logic:

• AnalyticsConnection
• BigTableConnection
• ObjectStoreConnection
• Consistent store Connection

Connection::init_watermark is overridden in these impls:

• Postgres Connection
• MockConnection

Test plan

No new functionality.

---

Release notes

Check each box that your changes affect. If none of the boxes relate to your changes, release notes aren't required.

For each box you select, include information after the relevant heading that describes the impact of your changes that a user might notice and any actions they must take to implement updates.

• Protocol:
• Nodes (Validators and Full nodes):
• gRPC:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:
• Indexing Framework:

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Project	Deployment	Actions	Updated (UTC)
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