Introduce neopdf_legacy as a separate crate and remove reqwest

[Radonirinaunimi]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 79.11133% with 865 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
neopdf_legacy/src/strategy.rs	81.68%	259 Missing ⚠️
neopdf_legacy/src/converter.rs	0.00%	238 Missing ⚠️
neopdf_legacy/src/gridpdf.rs	79.88%	72 Missing ⚠️
neopdf_legacy/src/interpolator.rs	88.83%	69 Missing ⚠️
neopdf_legacy/src/pdf.rs	73.50%	62 Missing ⚠️
neopdf_legacy/src/manage.rs	60.60%	52 Missing ⚠️
neopdf_legacy/src/parser.rs	74.12%	52 Missing ⚠️
neopdf_legacy/src/subgrid.rs	90.62%	21 Missing ⚠️
neopdf_legacy/src/writer.rs	92.91%	19 Missing ⚠️
neopdf_legacy/src/alphas.rs	94.98%	13 Missing ⚠️
... and 2 more

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