trim workaround (issue #77)

[pchalamet]

This is a workaround for issue #77 as describe in dotnet/runtime#43222 (comment)
Publish with trimming now works as expected.

This PR convert Serializer.Serialize<> and Serializer.Deserialize<> to non-generic counterparts.

NOTE: no performance impact has been done. This probably ought be checked (downcast :?> used).

[pchalamet]

Merged main.
Looks good with your changes on master.
Thanks.

[Tarmil]

After testing some more, it seems that only the calls parameterized by 'T[] are problematic; the ones parameterized by 'T or even seq<'T> can remain generic. And looking at this, there is definitely a performance impact for using the non-generic version at least for structs. So I'll merge the change only for 'T[].

[pchalamet]

Thanks for the feedback. Good to know!