feat: Add macros from swift-interception-macros package

[maximkrouk]

Macros approach is aligned with https://github.com/pointfreeco/swift-dependencies
Now they are a part of this package, but have a separate target

Pros vs shared target:

• Optional use of macros, core features are available without use of macros (macros increase cold compilation time, so not everyone is down to depend on them)

Pros vs separate macros package:

• Much easier to maintain
• Easier to import

Cons vs separate macros package:

• swift-syntax has to be resolved even if client doesn't use macros (however compilation time is not affected if client opts-out macros)

Notes:

• _InterceptionMacros target declares macros without exporting Interception target, this might be helpful for higher-order libraries development for example combine-interception may hide Interception APIs to constrain interception to Combine APIs, on the other hand InterceptionMacros target exports Interception for convenience.