Mininotation should support top-level `,` and `|`

[matthewkaney]

Describe the function/feature you'd like

Currently Strudel supports mininotation strings such as "0, 1" or "0 | 1" while Tidal requires those operators to be wrapped in brackets. The Tidal parser should support this.

More of a stretch: it might be nice to support the combined use of these operators. I'd propose that stacking have a lower precedence than random choice, that is: "0 | 1, 2 | 3" == "[0 | 1], [2 | 3]"

Potentially a part of #952

[yaxu]

Ref https://github.com/tidalcycles/strudel/issues/284

[polymorphicengine]

i can implement this and add it to the open PR for the parser when i have time