Serialization guide for Typescript

[slinkydeveloper]

Fix #379

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[slinkydeveloper]

The new page: https://4c0ea596.documentation-beg.pages.dev/develop/ts/serialization

[gvdongen]

Maybe we should add an example of a Serde implementation as well? Just to show the template? Since the serializer you use here is actually still integrated in the Restate SDK.
For Python, I did this as follows: https://python-quickstart.documentation-beg.pages.dev/develop/python/serialization
Or do you think that is too much?

[gvdongen]

Besides that LGTM 👍

[slinkydeveloper]

I think it's ok, it's a simple enough interface, people will figure out themselves, no need to overload the docs.

[slinkydeveloper]

What I think would help tough is serving the tsdocs, so we could link the Serde interface from here and one could immediately see how it looks like.