Added dynamic gas station price based using API

[razvantomegea]

Issue/Feature

Add dynamic fetching of gas station metadata to provide more accurate gas price estimations based on current network conditions.

Reproduce

Before this change, the dApp did not fetch real-time gas price recommendations (fast/faster) specific to the user's shard from the network's gas station endpoint. Gas price suggestions might not have accurately reflected current network congestion.

Root cause

The ProviderInitializer component and the network configuration state lacked the functionality to dynamically fetch and store gas station metadata (recommended gas prices) based on the logged-in user's shard.

Fix

• Introduced a new API call getGasStationMetadataFromApi to fetch gas price metadata (fast, faster, lastBlock) for a specific shard from the /transactions/ppu/{shard} endpoint.
• Modified ProviderInitializer.tsx to:
  • Detect when a logged-in user's account data (including shard) is available and gas station metadata is missing in the network config.
  • Call updateGasStationMetadata function which uses the new API call.
  • Dispatch an updateNetworkConfig action with the fetched gasStationMetadata.
• Updated the NetworkType and BaseNetworkType in src/types/network.types.ts to accommodate the new structure of gasStationMetadata (keyed by shard number).

Additional changes

• Updated CHANGELOG.md with the new feature.
• Added tests and updated existing tests (getGasPriceDetails.test.ts) to reflect the usage of the new gasStationMetadata structure.
• Added getGasStationMetadata.ts to apiCalls/configuration and updated the corresponding index file.
• Added getLatestBlock to apiCalls/blocks. Useful to fetch latest block.

Contains breaking changes

• No
• Yes

Updated CHANGELOG

• No
• Yes

Testing

• User testing (Verify gas price suggestions in components like ConfirmFee reflect fetched metadata)
• Unit tests (Added/updated relevant tests)