added functions for rotating and reversing array in parts

[Nirbhayparmar]

• New function name- array_rotate and array_reverse_part
• Short Description
  • array_rotate function can rotate array in counter clockwise direction (left) by given number of steps
  • array_reverse_part function can reverse specific part of the array like last two element or any subarray
• References (documentation, links, etc.)
  • I took this idea from a GFG question or rotating array
• Limitations (If it has any edge cases)
  • Currently this function is only applicable to array having scalar values. for objects like element I think I need to implement deep copy to prevent mutating original array.

[Nirbhayparmar]

this is for issue #15

[Nirbhayparmar]

Please review the PR.

[Hetarth02]

I will soon be reviewing all the PRs(Probably by the end of coming Saturday and Sunday). Sorry for the wait.

[Nirbhayparmar]

No problem, Its okay.