ConfigurationBindingGenerator should move to GetInterceptableLocation API

[RikkiGibson]

Roslyn just introduced a new API for creating [InterceptsLocation] attributes in generated code. This uses a new opaque encoding for the location.

We'd like our partners to onboard to this new API as soon as is feasible. (We just merged it so may be a day or two before arcade will start handing out compilers which contain it.)

The old path-line-column approach is going to be deprecated and support removed prior to stable release of the feature.

[tarekgh]

CC @ericstj

[ericstj]

We should adopt this in the 9.0 codebase and potentially in 8.0 servicing - in case that's impacted by the removal of the file/line/character support. I think it will be since we can target net8.0 from the latest VS.

We might need to call the new API through light-up to avoid binding to the new compiler version - if we can't garuntee it's availability everywhere we need it.

@RikkiGibson which versions of VS will get this update?

[RikkiGibson]

The GetInterceptableLocation API will ship in VS 17.11 preview 1.

[ericstj]

I think we'll need to call it through lightup for some time. Check for the presence of GetInterceptableLocation and use it if present. That way the generator doesn't take a hard dependency on the new compiler.

That's the only way we can call it for the 8.0 generator. If the old path-line-column approach is pulled out eventually then we'll need to backport this to 8.0 so that it will continue to work.

[steveharter]

@RikkiGibson I started working on this and see that for one of the tests under Net462 tests, the encoded value isn't stable.

See main...steveharter:runtime:NewInterceptors

I didn't do much debugging, but thought I would put this out there right away.

file: BindConfiguration.generated.txt

[InterceptsLocation(1, "FzkxwRstvs6328ZsAVyIXIMBAABzcmMtMC5jcw==")]
public static OptionsBuilder<TOptions> BindConfiguration<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class

First the test will fail with:
Expected Line:
        [InterceptsLocation(1, "FzkxwRstvs6328ZsAVyIXIMBAABzcmMtMC5jcw==")]
Actual Line:
        [InterceptsLocation(1, "l8J97SL0L7K7qKFZC0gWZoMBAABzcmMtMC5jcw==")]

If I change the expected to the actual then it flips around:
Expected Line:
        [InterceptsLocation(1, "l8J97SL0L7K7qKFZC0gWZoMBAABzcmMtMC5jcw==")]
Actual Line:
        [InterceptsLocation(1, "FzkxwRstvs6328ZsAVyIXIMBAABzcmMtMC5jcw==")]