Turn unions of literals into enums

[A5rocks]

This is useful especially for integer literals. Here's where I noticed the current behavior:

                          "type": {
                            "oneOf": [
                              { "type": "number", "enum": [1] },
                              { "type": "number", "enum": [2] },
                              { "type": "number", "enum": [3] },
                              { "type": "number", "enum": [4] },
                              { "type": "number", "enum": [5] },
                              { "type": "number", "enum": [6] },
                              { "type": "number", "enum": [7] },
                              { "type": "number", "enum": [8] },
                              { "type": "number", "enum": [9] },
                              { "type": "number", "enum": [10] },
                              { "type": "number", "enum": [11] }
                            ]
                          },

Debatably, it might be nicer to split cases like z.union(z.literal(4), z.literal(5), z.literal("h"), z.literal("i")) into 2 different groups and give those to the oneOf, which is really not possible the way I went around this. I suspect that case is significantly rarer, however.

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[A5rocks]

To provide some connection to the opened issues, this is sort of a special case for the inverse of https://github.com/anatine/zod-plugins/issues/70 (this is a special case for a join operation, vs that issue asking about implementing a meet operation)