Add support for `PFADD` command

[Vsareen0]

Add support for the PFADD command in DiceDB similar to the PFADD command in Redis. Please refer to the following commit in Redis to understand the implementation specifics - source.

Write unit and integration tests for the command referring to the tests written in the Redis codebase 7.2.5. For integration tests, you can refer to the tests folder. Note: they have used TCL for the test suite, and we need to port that to our way of writing integration tests using the relevant helper methods. Please refer to our tests directory.

For the command, benchmark the code and measure the time taken and memory allocs using benchmem and try to keep them to the bare minimum.

[Vsareen0]

Assigned to myself @JyotinderSingh / @arpitbbhayani

[arpitbbhayani]

@Vsareen0 how close are we to completing this? what is ETA?

[Vsareen0]

Hey @arpitbbhayani Sorry for the delay, will try to close this by this Sunday.

[Vsareen0]

hey @arpitbbhayani Sorry for time consumption, I tried but unable to write implementation for this. You can reassign to someone else.

[AshwinKul28]

Thanks @Vsareen0 for the update.

cc @JyotinderSingh Please open it for everyone and someone else can pick this up.

[kailashchoudhary11]

Hey @JyotinderSingh , I would like to take this up.

[lucifercr07]

Have started working on this as part of assigned parent issue.

[lucifercr07]

@JyotinderSingh we can close this issue as implemented as part of PR here.