[Feature] Update default datatypes for `value_decimal`

### Is there an existing feature request for this?

- [x] I have searched the existing issues

### Describe the Feature

For the source `feedback_form_field`, we set the default datatupe for `value_decimal` as numeric, but really the connector passes it in as a string.

### How would you implement this feature?

[This line](https://github.com/fivetran/dbt_lever_source/blob/main/macros/get_feedback_form_field_columns.sql#L10) of the macro needs to be updated.

### Describe alternatives you've considered

_No response_

### Are you interested in contributing this feature?

- [ ] Yes.
- [ ] Yes, but I will need assistance.
- [ ] No.

### Anything else?

_No response_