[WIP] Axis

[palnabarun]

Added relevant conversions.
The conversions added by me are generic to most of the encoding data types, there might be certain instances where some corner cases are handled.

TODO

• Tests

[codecov]

Codecov Report

Merging #18 into master will increase coverage by 19.92%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           master      #18       +/-   ##
===========================================
+ Coverage   62.81%   82.74%   +19.92%     
===========================================
  Files          13        7        -6     
  Lines         589      313      -276     
  Branches       62       35       -27     
===========================================
- Hits          370      259      -111     
+ Misses        218       54      -164     
+ Partials        1        0        -1

Impacted Files	Coverage Δ
mplaltair/_axis.py	0% <0%> (-12.66%)	⬇️
mplaltair/tests/test_parse_chart.py
mplaltair/_marks.py
mplaltair/parse_chart.py
mplaltair/tests/test_utils.py
mplaltair/_utils.py
mplaltair/tests/test_axis.py
mplaltair/tests/test_data.py	100% <0%> (+3.44%)	⬆️
mplaltair/_data.py	100% <0%> (+6.52%)	⬆️
mplaltair/tests/test_convert.py	100% <0%> (+24.09%)	⬆️
... and 1 more

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