Build and test python

[vidyalakshmir]

@qianxichen233 and @vidyalakshmir worked on this.

This PR is aimed at

1. Producing both static and dynamic builds of python.
2. Run python tests for both static and dynamic builds.
3. Adds a clean.sh which cleans up python builds.

This is a cleaned up PR from the following PRs

• PR 32
• PR 120
• PR 122

Closes #40
Closes #128
Closes #148
Closes #113

Testing

Test dynamic build of python

APP=cpython make clean
LIND_DYLINK=1 make cpython
LIND_DYLINK=1 APP=cpython make test

Test static build of python

APP=cpython make clean
cd lind-wasm-apps
make cpython
APP=cpython make test

[qianxichen233]

this file is redundent, should remove