Auto fix fieldalignment with this tool at the end of generation steps

[frederikhors]

What happened?

In generated code we have a lot of structs with misaligned fields (the issue is well described here: https://qvault.io/golang/struct-field-ordering-memory/).

What did you expect?

To auto-fix this we can launch at the end of generation this tool:

go install golang.org/x/tools/go/analysis/passes/fieldalignment/cmd/fieldalignment@latest

with this command:

fieldalignment -fix <package_path>

I don't know how to create a PR for this otherwise I would have already done it.

Thanks for your precious work!

[switchupcb]

Here is a start @frederikhors: #2069