Add methods for computing discrete log
Add methods for computing discrete log

Refs -- sympy/sympy#11502

yashsharan/sympy,madan96/sympy,jaimahajan1997/sympy,jaimahajan1997/sympy,madan96/sympy,chaffra/sympy,souravsingh/sympy,chaffra/sympy,yashsharan/sympy,yashsharan/sympy,chaffra/sympy,jaimahajan1997/sympy,aktech/sympy,souravsingh/sympy,skidzo/sympy,aktech/sympy,kaushik94/sympy,kaushik94/sympy,kaushik94/sympy,aktech/sympy,skidzo/sympy,souravsingh/sympy,skidzo/sympy,madan96/sympy