feat: add support for pdf a

[prog-r-amer]

Hi,

my first rust code ever, if there's something to improve please tell me.
I needed the Compiler option for PDFA2 from typst.

[Myriad-Dreamin]

Thank you for submitting the PR. Overall, I don't see much problem inside.

[prog-r-amer]

Thanks for looking at the pull request. Isn't the enum still the better way cause it's typed? I think that's pretty helpful.

[Myriad-Dreamin]

Isn't the enum still the better way cause it's typed? I think that's pretty helpful.

I'm not pretty like to force the typing here, as we might have v1.8, v1.9 and more in future. They sounds not really a list that can be exhausted.

Instead we can provide an enum but I think it is better to be provided as string enum at js/ts side. I believe they would be convenient as well:

enum PdfStandard {
    V_1_7 = "v1.7",
    A_2b = "A2b",
}

The latter one (string enum at js/ts side) should provide an optional typing, and people can avoid using it if they don't like it.

[prog-r-amer]

Hi, I updated the pull request. I am not 100% sure if thats what you wanted but that's why there is a reviewer ;)

[Myriad-Dreamin]

Hi, I updated the pull request. I am not 100% sure if thats what you wanted but that's why there is a reviewer ;)

Sure, I'll improve usability then and @ you in the later PR.

The final remaining thing is to fix the failed tests. You can run it on your repository's GitHub Action or manually run the command in local.

[prog-r-amer]

finally found the time and motivation to fix the pipeline stuff.

[Myriad-Dreamin]

I was planning to add my effort in a separated PR, but I find all added tests failed because of 79021d7.