Add deprecated attributes modelled off zstd.h definitions

[petesmc]

Using the definitions in zstd.h, marked the relevant functions as deprecated in the code and where possible added the since and note tags.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
test-aarch64-apple-darwin	33.19% <100.00%> (-0.24%)	⬇️
test-aarch64-unknown-linux-gnu	31.67% <100.00%> (-0.04%)	⬇️
test-i686-unknown-linux-gnu	31.72% <100.00%> (-0.04%)	⬇️
test-x86_64-unknown-linux-gnu	33.45% <100.00%> (+0.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
lib/compress/zstd_compress.rs	37.47% <ø> (-1.28%)	⬇️
lib/decompress/zstd_decompress.rs	63.90% <ø> (+1.85%)	⬆️
lib/decompress/zstd_decompress_block.rs	76.39% <ø> (ø)
lib/dictBuilder/zdict.rs	78.83% <100.00%> (-2.27%)	⬇️

... and 3 files with indirect coverage changes

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