Update lisk-chain to save/delete events together with block

[shuse2]

Description

• Update lisk-chain to store data as below

const DB_KEY_BLOCK_EVENTS = Buffer.from([9]);
key = DB_KEY_BLOCK_EVENTS || uint32(height)
value = {
  events: {
    moduleID: number,
    typeID: number,
    topics: Buffer[],
    data: Buffer,
    index: number,
  }[]
}

• save and remove functions should receive the events as parameter and store/remove accordingly
• Genesis block also should receive the events as input

Acceptance Criteria

• storing data is tested with unit and integration tests
• All builds and tests are passing