Psalm: Add support for tuples

[vudaltsov]

Sometimes you need to hint a tuple before destructuring it. I seems that currently we can achieve that only with array{0: string, 1: int} hint, which is verbose and error-prone.

I suggest introducing one of the following enhancements to resolve the issue:

• array{string, int}
• array-tuple{string, int}
• list{string, int}

[psalm-github-bot[bot]]

Hey @vudaltsov, can you reproduce the issue on https://psalm.dev ?

[muglug]

@vudaltsov your first example already works!

[muglug]

Although one enhancement that could be made would be to treat array{string, int} as an explicit list, as opposed to a dictionary as it is now