refactor: remove StaticHint wrapper, log duplicate hints

[gbotrel]

• refactor: remove statichint
• feat: log.Warn when duplicate hint registration.

See #287 -->

This PR;

1. Removes the NewStaticHint wrapper, that allowed for custom UUID (which we don't want to)
2. "Allows" duplicate hint registration with a trace in log.Warn. Duplicate hint registration may occur when importing a package when a hint is declared and registered in a init() function and adding it manually / through std.RegsiterHints . In practice, duplicate UUID for a function would occur only in the same package so it seems improbable to be possible for a malicious actor to replace a hint (which would not be any more a security issue than importing unknown code).

[ivokub]

Looks good.