[FEATURE] Implement infrastructure to generate permutation

[VascoSch92]

Implement the infrastructure to generate permutation following a specific algorithm.

Proposed API

from symmetria import generate
...
for permutation in generate(algorithm="lexicographic", degree=4):
    print(permutation)

The first step is:

• [MAINTENANCE][FEATURE][DOC] Develop structure to generate permutation, and update the documentation #88

It follows a list of algorithm of permutations we want to implement:

• [FEATURE] Lexicographic ordering #90
• [FEATURE] Colexicographic ordering #105
• [FEATURE] Steinhaus–Johnson–Trotter algorithm #97
• [FEATURE] Heap's algorithm #94
• Ehrlich's star-transposition algorithm;
• [FEATURE] Zaks' prefix reversal algorithm #106
• Sawada-Williams' algorithm;
• Corbett's algorithm;
• Single-track ordering;
• Single-track Gray code;
• Nested swaps generating algorithm;

Reference: https://en.wikipedia.org/wiki/Permutation#Numbering_permutations

[VascoSch92]

Think about the possible API

import symmetria

permutations = symmetria.generate(...)

We could use the same for random

import symmetria

random = symmetria.random(...)

Until there is no a new version, we can still change that.