Chore: Source refactor

[tmosleyIII]

This pull request updates dependencies in the stellar-live-source-datalake Go module and refactors how LedgerCloseMeta is converted to the protobuf type. The most important changes are the adoption of a shared conversion core to prevent drift between services, and a comprehensive update to dependency versions for improved compatibility and security.

Dependency Updates:

• Upgraded core dependencies in go.mod, including go version (to 1.25.4), google.golang.org/grpc (to 1.80.0), and many indirect dependencies such as cloud.google.com/go, aws-sdk-go-v2, prometheus, and opentelemetry packages. These updates improve compatibility, security, and performance. [1] [2] [3]
• Added the new dependency github.com/withObsrvr/stellar-raw-ledger-origin v0.2.0 for shared raw ledger conversion logic.

Code Refactoring for Consistency:

• Updated server.go to import the shared raw ledger conversion core (rawledgercore) and delegate the conversion from LedgerCloseMeta to RawLedger to this shared module. This ensures consistent conversion logic across services and reduces maintenance overhead. [1] [2]

Protocol Buffer Mapping:

• The conversion now explicitly maps only the common fields (sequence and ledger_close_meta_xdr) from the shared core to the service's protobuf type, omitting fields not present in the service's proto (like network passphrase and closed_at).

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