Configure Interaction to support different number types other than double

[rholshausen]

Currently, a gRPC Google Struct is used to model values, and these structs only support numeric types in double precision floating point format. It means that any integer values need to be converted to doubles, and that information is lost when the matching is executed.

[github-actions]

👋 Hi! The 'smartbear-supported' label has just been added to this issue, which will create an internal tracking ticket in PactFlow's Jira (PACT-1135). We will use this to prioritise and assign a team member to this task. All activity will be public on this ticket. For now, sit tight and we'll update this ticket once we have more information on the next steps.

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