Add local ingestion client to indexer-alt (#19924)

## Description 

This PR adds an IngestionClientTrait that abstracts over checkpoint
fetching.
The existing one is moved into RemoteIngestionClient.
Added a new one LocalIngestionClient to read from files.
The retry logic is kept in a top-level struct, which then calls into the
traits. Each trait decides the type of error for various cases.

## Test plan 

Added a test.

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## Release notes

Check each box that your changes affect. If none of the boxes relate to
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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): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] REST API:

crates/sui-indexer-alt/Cargo.toml

@@ -39,5 +39,6 @@ sui-types.workspace = true
 [dev-dependencies]
 rand.workspace = true
 wiremock.workspace = true
+tempfile.workspace = true
 
 sui-types = { workspace = true, features = ["test-utils"] }