Serialize and Deserialize for `PdfStandard` (#5108) #1

Job	Run time
Check minimum Rust version	2m 37s
Check fuzzers	8m 39s
Check clippy, formatting, and documentation	4m 49s
Tests (ubuntu-latest)	6m 41s
Tests (windows-latest)	12m 16s
Tests	1s
	35m 3s

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