Adding generic test cases format for the file test_case_generator

[kuspia]

This is a kind of feature request where we can add generic test cases format for the file test_case_generator.cpp file.
Example:

1.
T
n
A1 A2 ... An
2.
n
A1 A2 ... An
B1 B2 ... Bn
3.
n m
A1 A2 ... An
B1 B2 ... Bm
4.
T
n
A1 A2 ... An [where every a_i is distinct]
5.
T
n m 
M [where M is a matrix of size n*m]

I have just put a few formats one can think many and provide neat documentation here on this repo and display documentation link when a user executes the test_generator file, if the type is found he can simply choose a type number, or else he has to write the .cpp file on his own.

I want to make it CLI-based shows the test case type available already so that the user can just choose and generate it without writing code for a common test cases format, moreover from CLI user can provide total test cases, constraints, etc.