Start quotation examples

[dsyme]

Part of #12124

[dsyme]

I added many more examples to quotations (for Expr and DerivedPatterns)

They are quite hard to review because of the amount of < and > escaping that goes on. I ran them all manually one by one before doing the escaping.

So I will merge and we can do further post-hoc review once the docs at

• https://fsharp.github.io/fsharp-core-docs/reference/fsharp-quotations-fsharpexpr.html and
• https://fsharp.github.io/fsharp-core-docs/reference/fsharp-quotations-derivedpatternsmodule.html

have regenerated.