Remove version specific prefixes from builders

[Michael-J-Ward]

Fixes #3085

Should I also change thet non-public methods in proto::h1::conn?

• set_http1_header_read_timeout
• set_h1_parser_config

[seanmonstar]

This looks super, thanks so much! I see there's a fixup! commit in the list, did you want to rebase and do the fix locally? The merge button only lets me either rebase merge without interactive mode, or squash it all into a single commit.

[Michael-J-Ward]

done ✅