chore(all): rewrite runtime type assertions to not allocate memory

[qdm12]

var _ MyInterface = &MyStruct{}

does allocate memory at global scope. Over many packages, that can build up to a few kilo bytes used for no reason.

We can batch replace these with:

var _ MyInterface = (*MyStruct)(nil)

⚠️ Don't modify upstream geth code!

We can use the regex _ [A-Za-z].*[ ]+=[ ]+&[A-Za-z].*\{\} to find all of them and replace them manually one by one. There are only around 40 of them as of today.

[darioush]

Great idea, however we should be careful to not apply this to shared files with upstream.