feat: All account balances (#128)

* Add AllAccountBalances API and fix URL naming consistency

This commit introduces two key enhancements:

1. AllAccountBalances API:
   - Added POST /account/all-balances endpoint
   - Consolidates multiple sub-account balance queries into single request
   - Ensures consistent block context for all balances
   - Added AllAccountBalancesRequest, AllAccountBalancesResponse, and AccountBalanceWithSubAccount schemas
   - Removed root-level metadata from AllAccountBalancesResponse (metadata belongs to individual sub-accounts)

2. URL Naming Consistency:
   - Changed /construction/preprocess_operations to /construction/preprocess-operations
   - Maintains kebab-case convention across all Rosetta endpoints
   - Updated both endpoint path and description references

Benefits:
- Reduced network latency (single request vs multiple)
- Improved data consistency (same block context)
- Backward compatible (existing /account/balance unchanged)
- Optional implementation for Rosetta servers

Files modified:
- api.yaml: Added new endpoint and schemas, fixed URL naming
- api.json: Regenerated specification bundle

* Remove SubAccountIdentifier field from AccountBalanceWithSubAccount schema

- Remove sub_account_identifier field from AllAccountBalancesResponse
- Update descriptions to reflect that balance identification relies on balance_type and metadata
- Simplifies API by removing redundant field that is rarely used in practice

Add ConstructionPreprocessOperations API endpoint (#127)

This endpoint provides fallback parsing for high-level transaction
construction operations when local OperationSelector doesn't support
certain construct operations.

Features:
- Input format matches TransactionConstructOpInput from chainstdio
- Output format matches ParseTransactionConstructOp return values
- Optional API (servers can return 501 Not Implemented)
- Full OpenAPI specification with request/response schemas
- Maintains compatibility with existing operation parsing workflows

Endpoint: POST /construction/preprocess_operations
Request: ConstructionPreprocessOperationsRequest
Response: ConstructionPreprocessOperationsResponse

bump version to 1.5.1 so that versions will match (#126)

feat: support bip340 (#114)

Merge pull request #110 from coinbase/jingwei/remove-fields-preprocess

[preprocess]remove max_fee and mulltiplier in preprocess request

Update API version to 1.4.13 (#105)

update tag to latest commit

Add pallas curve to spec (#93)

Add Support for Related Transactions (#74)

* add modeling for related transactions

* bump version

* fix quotes

* nit

Merge pull request #71 from coinbase/patrick/network-status-tip

Return `Synced` Status