Implement RENAME command

[kelvinmwinuka]

Implement the RENAME command, which renames the specified key with the new name.
Reference: https://redis.io/docs/latest/commands/rename/

Client-Server Spec:

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

Command: rename
Module: constants.GenericModule
Categories: constants.KeyspaceCategory, constants.WriteCategory, constants.SlowCategory
Description: (RENAME key newkey) Renames the specified key with the new provided name.
Sync: true

Embedded Spec:

Command File: ./echovault/api_generic.go
Test File: ./echovault/api_generic_test.go

NOTE: You may have to edit the HandlerFuncParams type to include a function that renames keys. Alternatively, you could use the GetValues, DeleteKeys and SetValues methods together to delete the old key and set a new key with the old value. The first approach would be more atomic, though.

At the moment, only replication clusters exist without sharding. So the key should be renamed across the entire cluster.

[dotslashbit]

working on it