Update installation setup to a PEP517 build backend

[awvwgk]

Description

Change from the two step build process (meson + setuptools) to a single step build process (meson-python).

Changelog description

• use meson-python as build backend.

[codecov]

Codecov Report

Merging #95 (48c0cb3) into main (3335421) will decrease coverage by 97.10%.
The diff coverage is 0.00%.

❗ Current head 48c0cb3 differs from pull request most recent head f91e429. Consider uploading reports for the commit f91e429 to get more accurate results

@@            Coverage Diff             @@
##             main     #95       +/-   ##
==========================================
- Coverage   97.10%   0.00%   -97.11%     
==========================================
  Files           8      14        +6     
  Lines         449     860      +411     
==========================================
- Hits          436       0      -436     
- Misses         13     860      +847     

Impacted Files	Coverage Δ
xtb/test_interface.py	0.00% <0.00%> (ø)
xtb/utils.py	0.00% <0.00%> (-100.00%)	⬇️
xtb/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
xtb/qcschema/harness.py	0.00% <0.00%> (-100.00%)	⬇️
xtb/ase/calculator.py	0.00% <0.00%> (-98.96%)	⬇️
xtb/interface.py	0.00% <0.00%> (-97.37%)	⬇️
xtb/libxtb.py	0.00% <0.00%> (-94.60%)	⬇️
xtb/ase/__init__.py	0.00% <0.00%> (-50.00%)	⬇️
xtb/qcschema/__init__.py	0.00% <0.00%> (-50.00%)	⬇️
xtb/qcschema/test_qcschema.py	0.00% <0.00%> (ø)
... and 5 more

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