Implement HELLO command

[kelvinmwinuka]

Implement HELLO command that modifies the connection's RESP version and optionally authenticates the connection.
Reference: https://redis.io/docs/latest/commands/hello/

Client-Server Spec:

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

Command: hello
Module: constants.ConnectionModule
Categories: constants.ConnectionCategory, constants.FastCategory
Description: (HELLO [protover [AUTH username password] [SETNAME clientname]]) Switch to a different protocol, optionally authenticating and setting the connection's name, or provide a contextual client report.
Sync: false

[kelvinmwinuka]

Working on this