docs: add @since tags to exports

[alexvyber]

Closes #1039
Adds @since tags to exports

[pkg-pr-new]

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npm i https://pkg.pr.new/thefrontside/effection@1089

commit: bee31ab

[cowboyd]

Here are a couple of tweaks:

1. Let's only use the major minor version since those are the only meaningful semver points that can introduce or change an api. I.e. instead of since @effection-v3.0.1, just @since 3.1
2. I've noted it in a couple of places, but it looks as though the version is not correct. In fact, it appears that all of the versions are either 3.0 or 4.0 which means we're losing something somewhere. For example, the scoped API was introduced in v3.2.0
3. For interface that have methods like Scope, we need to include their methods. For example Scope.run() was introduced in 3.0, but Scope.spawn() not until 3.5

[taras]

@alexvyber you've done all of the heavy lifting here. I don't want to rush you, but I do want to extend an hand in case you need help driving this over the finish line. Please let me know if there is anything I can do to help.