Changes featured in v1.2.0 release

Fixes

• fix: APIs returning response of data type array of json objects not supported.
• fix: Fetching private key every time increases goroutine count
• fix: Every time a new http client was introduced for each request increases goroutine count

Faster processing

• Processing of jobs and collections concurrently.
• Caching jobs and collections.
• Optimised GetIteration implementation with concurrency.
• Optimised CalculateBiggestStake using batch calls for getStakeSnapshot contract calls

RPC Optimisation

• Reduce GetLatestBlock and GetStakerId calls

Refactor changes

• Refactor: Flag input function refactored using a single generic function
• Refactor: Config getters and setters module refactored using a generic function.
• Refactor: Refactored tests by removing redundant mocks and test util functions.

Config changes

• Updated default values for logFileMaxAge and logFileMaxBackups