Fix/poetry-import

[frostming]

Pull Request Check List

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

Close #1131

[adam-grant-hendry]

@frostming Be careful with your changes. license can also accept a file argument, not just a text argument. You're going to have to support both to be PEP 621 compliant:

The table may have one of two keys. The file key has a string value that is a relative file path to the file which contains the license for the project. Tools MUST assume the file’s encoding is UTF-8. The text key has a string value which is the license of the project whose meaning is that of the License field from the core metadata. These keys are mutually exclusive, so a tool MUST raise an error if the metadata specifies both keys.

A practical string value for the license key has been purposefully left out to allow for a future PEP to specify support for SPDX expressions (the same logic applies to any sort of “type” field specifying what license the file or text represents)

[frostming]

@adam-grant-hendry

Thank you, I am only changing the format converter, per poetry and flit's old metadata format, the license field of both accepts a string representing the license name, which goes to text sub field.

[codecov-commenter]

Codecov Report

Merging #1133 (0661370) into main (af71fc8) will decrease coverage by 0.03%.
The diff coverage is 58.33%.

@@            Coverage Diff             @@
##             main    #1133      +/-   ##
==========================================
- Coverage   84.37%   84.33%   -0.04%     
==========================================
  Files          74       74              
  Lines        6579     6582       +3     
  Branches     1544     1546       +2     
==========================================
  Hits         5551     5551              
- Misses        698      701       +3     
  Partials      330      330              

Flag	Coverage Δ
unittests	84.09% <58.33%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
pdm/formats/flit.py	75.55% <0.00%> (ø)
pdm/formats/poetry.py	89.85% <50.00%> (-2.00%)	⬇️
pdm/formats/legacy.py	76.92% <100.00%> (ø)

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