decimal types fail because precision is negative

name: Feature request
about: Suggest an idea for this project
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Is your feature request related to a problem? Please describe.

A SQL Server tap generates a schema for a decimal column that looks like this:

          "Amount": {
            "inclusion": "available",
            "multipleOf": 0.01,
            "type": [
              "null",
              "number"
            ]
          }

This results in an error message: ValueError: valid range for prec is [1, MAX_PREC]

Upon inspection, the error is raised because the precision value calculated in https://gitlab.com/singer-core/target-core/-/blob/main/src/target/stream.py#L98 is -2. This is outside of the valid range [1, MAX_PREC]

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