Improve rendering when using multiple / large labels#21958

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ojeda-e wants to merge 5 commits intomatplotlib:mainfrom

ojeda-e:issue21895

Commits on Dec 15, 2021

moved cache to Text attribute.
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0a843d0
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Added __setstate__ in Text to pickle weakref
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5af1662
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Replaced maxdict by dict. Added draw_without_rendering in test.
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7399b7f
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Commits on Dec 16, 2021

Replaced setstate with dict.
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15b28c0
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fixed Flake8
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cc4307b
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