Implement HSCAN command

[kelvinmwinuka]

Scans the entries of a hash.
Reference: https://redis.io/docs/latest/commands/hscan/

Client-Server Spec:

Command File: ./internal/modules/hash/commands.go
Test File: ./internal/modules/hash/commands_test.go

Command: hscan
Module: constants.HashModule
Categories: contants.HashCategory, constants.ReadCategory, constants.SlowCategory
Description: (HSCAN key cursor [MATCH pattern] [COUNT count] [NOVALUES]) scan the entries of a hash
Sync: false

Embedded Spec:

Command File: ./echovault/api_hash.go
Test File: ./echovault/api_hash_test.go

Documentation

Add documentation to ./docs/docs/commands/hash/hscan.mdx