Bridge type

[dusannosovic-ethernal]

Description

This pull request introduces a new Bridge type that manages multiple bridge managers. The Bridge type contains a map of bridge managers, with the chainID as the key. The primary purpose of the Bridge type is to serve as a wrapper around these bridge managers. It iterates through all the bridge managers and invokes their respective functions.

Bridge type functions:

• Close()
• PostBlockAsync(req *PostBlockRequest)
• PostBlock(req *PostBlockRequest) error
• PostEpoch(req *PostEpochRequest) error
• BridgeBatch(pendingBlockNumber uint64) ([]*BridgeBatchSigned, error)
• InsertEpoch(epoch uint64, tx *bolt.Tx) error

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually