FEATURE/LAM-3 Initial implementation

[RHDZMOTA]

Reference issue: #3

This PR contains an initial implementation of the core concepts for the micro-lambda idea:

• Basic core entities such as MLambda and Arguments
• A shared catalog called MLambdaCatalog containing shortcuts/aliases and facilitator methods.
• A simple parser that enables the string-syntax.

Example:

from fred.mlambda.parser import MLambdaCatalog

print("Available aliases in the catalog")
for key in MLambdaCatalog:
    print(key)

from fred.mlambda.parser import MLambdaParser

out1 = MLambdaParser.from_string("${STROPS: hello, upper}").execute()
print(out1)

out2 = MLambdaParser.from_string("${RAND: a, b, c, k=1}").execute()
print(out2)