POW BLockchain in Go (Kinda)

Since this is first try at this implementation, I tried to approach at it with my own perpective but that won't mean it lacks basic functionalities.

Key thing to note : Use Go version 1.18.1 because ecdsa.GenerateKey stopped being dterministic with v1.20 and elliptic.P256() was deprecated.

Some of the Key Features include Consensus Algorithm, Wallets, Database, Merkle Tree and many more. WIP so everything will get better.

Functionalities and Design Choices :

1. Uses CLI for interaction with the Blockchain.
2. Difficulty of signed blocks remains constant unlike the real implementaiton.
3. Instead of deriving the public key using complicated methods like in the bitcoin blockchain, this implementation uses arbitrary keys.
4. Constant Reward with no fancy algo.
5. Since badgerDB only accepts array of bytes or slices of bytes, we have to serialize and deserialize.
6. Though in the original blockchain implementation each block has it's own separate file for efficiency, this project won't use that mainly because it's a small project
7. Rather than Badger's native iterator, implemented my own.
8. Used Goexit() instead of os.Exit() so as to give time to badger to proerly garbage collects as the go routines are being shut down. this prevents data corruption.
9. Used ECDSA(Eliptical curve digital signing algo) to generate public and private key.