Remove dependency on winapi crate

[cgettys-microsoft]

Currently, rust_win_etw depends on winapi transitively in at least two places:

1. win_etw_tracing via enabling tracing-subscriber's ansi feature (part of its default features)
   This increases compile times for those who don't need it. The tracing-subscriber ansi feature requires nu-ansi-term 0.46.0 for tracing-subscriber = "0.3.18"
   This in turn requires winapi, which hasn't received updates in years and doesn't support some windows targets like arm64ec-pc-windows-msvc.

While I'll look at whether tracing will accept a nuget bump to nu-ansi-term v0.47.0 as well (which moves to windows-sys), given we don't need to turn on this feature at all, I'd prefer to just not enable the feature if it isn't a breaking change (or if there's willingness to bump to 0.2.0).

2. win_etw_provider
   A) via w32-error
   B) via direct dependency

[cgettys-microsoft]

w32-error doesn't seem to actually be used.