* protocol: extract response type
* deps: drop lazy_static and regex
* protocol: extract request commands
* protocol: create a struct for...
...formatting and parsing sonic protocol
* protocol: refac flush command
* commands: introduce dest, refac push and count
* commands: refac all commands
* commands: add convinient methods
* doc: add documentation for each new structs
* doc: change examples in the readme
* commands: implement from trait for count and flush
* commands: change pag logic
