Add SciPy test suite

[agriyakhetarpal]

This PR adds the SciPy test suite that exists in scipy-pytest.js and is configured in scipy-conftest.py, and mechanisms to run it that were previously implemented in pyodide/pyodide#4935.

Closes #148

[github-actions]

Package Build Results

Total packages built: 33
Total build time: 0:17:30

Package Build Times (click to expand)

Package	Build Time
scipy	8m 16s
openblas	7m 32s
openssl	5m 54s
boost-cpp	5m 15s
numpy	5m 10s
sqlite3	2m 5s
liblzma	1m 6s
test	39s
libf2c	35s
regex	19s
lzma	9s
pydoc_data	8s
hashlib	8s
ssl	7s
MarkupSafe	6s
pydecimal	6s
atomicwrites	5s
packaging	4s
pytz	3s
exceptiongroup	2s
micropip	2s
pytest	2s
pyparsing	2s
setuptools	2s
pluggy	1s
more-itertools	1s
attrs	1s
tblib	1s
six	1s
pytest-asyncio	1s
py	1s
Jinja2	1s
iniconfig	1s

Longest build: scipy (8m 16s)
Packages built in more than 10 minutes: 0

[agriyakhetarpal]

Okay, the test suite is passing with the current SciPy v1.14.1 – this is as expected, as these tests were running in pyodide/pyodide#5031. I'll suggest that we merge this for now, and explore any follow-ups here in subsequent PRs. Thank you!