feat: convenient vm() logging api

[qalisander]

Description

Usage of typed log function separated from vm() api seems a bit quirky for end users.
This pr adds possibility to write as below:

self.vm().log(Transfer { from, to, token_id });

Since Host trait should be dyn compatible, any use of generically typed functions or supertrait's functions is impossible. Unless we auto-implement logging-dedicated trait for every T: Host type.

Checklist

• I have documented these changes where necessary.
• I have read the DCO and ensured that these changes comply.
• I assign this work under its open source licensing.

[gligneul]

@qalisander, there are some CI fails. Could you take a look?

[qalisander]

@gligneul Done. Just missing imports

[gligneul]

looks great