Issue #6: Adjust module structure

[reckart]

• Allow importing the most important things via from averbis import ...
• Set up convenient imports from the core and highlighing modules while hiding the actual class/module structure from the outside

[codecov-io]

Codecov Report

Merging #7 (d46713d) into main (6752c44) will increase coverage by 0.72%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
+ Coverage   84.71%   85.44%   +0.72%     
==========================================
  Files           8       11       +3     
  Lines         818      804      -14     
==========================================
- Hits          693      687       -6     
+ Misses        125      117       -8     

Impacted Files	Coverage Δ
averbis/core/_rest_client.py	78.50% <ø> (ø)
averbis/highlighting/_utils.py	93.10% <ø> (ø)
averbis/__init__.py	100.00% <100.00%> (ø)
averbis/core/__init__.py	100.00% <100.00%> (ø)
averbis/highlighting/__init__.py	100.00% <100.00%> (ø)
tests/test_client.py	100.00% <100.00%> (ø)
tests/test_pipeline.py	99.03% <100.00%> (ø)
tests/test_project.py	100.00% <100.00%> (ø)
... and 1 more

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