[typescript] fix: explode: true should yield appended query params

[joscha]

Currently, when a query param is defined as:

        - name: context
          in: query
          required: true
          explode: true
          schema:
            type: array
            items:
              type: string

for a context of ['a','b','c'] it serializes the query incorrectly as:
?context=a,b,c
however, due to explode: true it should be:
?context=a&context=b&context=c.

The change in this PR makes sure that any query params with explode: true are serialized correctly.

It also fixes the exploded serialization for object types.

See example table here: https://swagger.io/docs/specification/serialization/#Query%20Parameters

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[macjohnny]

thanks for your contribution!

[bodograumann]

For anyone looking here, I just want to mention that this broke enum serialization in query parameter, but it is now fixed on master: #20210