Create module class, constants, schemas for validators module

[shuse2]

Description

Create validators module and define constants and schema. Add validators module and constants.ts, schema.ts and types.ts under the folder as specified in https://research.lisk.com/t/introduce-validators-module/317.

• Define store prefixes and invalid bls keys in constant.ts
• Define all data type in types.ts
• Define all schema for store in schema.ts

Implement init hook, and validate and store block time from the config in memory.

Acceptance Criteria

• All 4 files exist in the validators module folder

Additional Information

• Empty validator module file already exist
• blockTime will be defined in moduleConfig.blockTime

Related issue: #6668