Added ``CallbackFunction.from_python()`` method

[hcpchris]

• Closes #109 .

[codecov[bot]]

Codecov Report

Patch coverage: 50.54% and project coverage change: -0.25% :warning:

Comparison is base (a82cc75) 89.15% compared to head (59d9a1f) 88.91%. Report is 2 commits behind head on v.1.4-rc-branch.

:exclamation: Current head 59d9a1f differs from pull request most recent head a3d0a85. Consider uploading reports for the commit a3d0a85 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v.1.4-rc-branch #111 +/- ## =================================================== - Coverage 89.15% 88.91% -0.25% =================================================== Files 207 208 +1 Lines 29596 29776 +180 Branches 2243 2277 +34 =================================================== + Hits 26386 26475 +89 - Misses 2384 2451 +67 - Partials 826 850 +24 ``` | [Files Changed](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python) | Coverage Δ | | |---|---|---| | [highcharts\_core/chart.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19jb3JlL2NoYXJ0LnB5) | `54.15% <ø> (ø)` | | | [highcharts\_core/ai.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19jb3JlL2FpLnB5) | `45.03% <45.03%> (ø)` | | | [...harts\_core/utility\_classes/javascript\_functions.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19jb3JlL3V0aWxpdHlfY2xhc3Nlcy9qYXZhc2NyaXB0X2Z1bmN0aW9ucy5weQ==) | `87.15% <59.37%> (-4.11%)` | :arrow_down: | | [highcharts\_core/options/series/base.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19jb3JlL29wdGlvbnMvc2VyaWVzL2Jhc2UucHk=) | `72.21% <64.70%> (-0.21%)` | :arrow_down: | | [highcharts\_core/errors.py](https://app.codecov.io/gh/highcharts-for-python/highcharts-core/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=highcharts-for-python#diff-aGlnaGNoYXJ0c19jb3JlL2Vycm9ycy5weQ==) | `100.00% <100.00%> (ø)` | |

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