Field modification

[ASEM000]

Breaking changes

• Disallow mutable defaults in field defaults. factory is removed.
• use field(..., kind='POS_ONLY') instead of field(..., pos_only=True)
• use field(..., kind='KW_ONLY') instead of field(..., kw_only=True)
• Better error message for failed callbacks

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.12 :tada:

Comparison is base (2ddb9d9) 98.44% compared to head (baf7247) 98.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #65 +/- ## ========================================== + Coverage 98.44% 98.56% +0.12% ========================================== Files 13 13 Lines 2378 2374 -4 ========================================== - Hits 2341 2340 -1 + Misses 37 34 -3 ``` | [Impacted Files](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem) | Coverage Δ | | |---|---|---| | [pytreeclass/\_src/tree\_pprint.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-cHl0cmVlY2xhc3MvX3NyYy90cmVlX3BwcmludC5weQ==) | `94.36% <ø> (-0.02%)` | :arrow_down: | | [pytreeclass/\_\_init\_\_.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-cHl0cmVlY2xhc3MvX19pbml0X18ucHk=) | `100.00% <100.00%> (ø)` | | | [pytreeclass/\_src/code\_build.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-cHl0cmVlY2xhc3MvX3NyYy9jb2RlX2J1aWxkLnB5) | `100.00% <100.00%> (ø)` | | | [pytreeclass/\_src/tree\_base.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-cHl0cmVlY2xhc3MvX3NyYy90cmVlX2Jhc2UucHk=) | `100.00% <100.00%> (ø)` | | | [pytreeclass/\_src/tree\_util.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-cHl0cmVlY2xhc3MvX3NyYy90cmVlX3V0aWwucHk=) | `99.00% <100.00%> (+1.30%)` | :arrow_up: | | [tests/test\_treeclass.py](https://app.codecov.io/gh/ASEM000/PyTreeClass/pull/65?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Mahmoud+Asem#diff-dGVzdHMvdGVzdF90cmVlY2xhc3MucHk=) | `98.79% <100.00%> (-0.30%)` | :arrow_down: |

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