Add support for Google's numeric filter

Problem/Motivation

Currently the data_type for all metrics is set to string. This makes it hard to do comparisons.

For example, eventCount > 20.

Looking through the metadata returned by Google, there are a few different types:

• METRIC_TYPE_UNSPECIFIED Unspecified type.
• TYPE_INTEGER Integer type.
• TYPE_FLOAT Floating point type.
• TYPE_SECONDS A duration of seconds; a special floating point type.
• TYPE_MILLISECONDS A duration in milliseconds; a special floating point type.
• TYPE_MINUTES A duration in minutes; a special floating point type.
• TYPE_HOURS A duration in hours; a special floating point type.
• TYPE_STANDARD A custom metric of standard type; a special floating point type.
• TYPE_CURRENCY An amount of money; a special floating point type.
• TYPE_FEET A length in feet; a special floating point type.
• TYPE_MILES A length in miles; a special floating point type.
• TYPE_METERS A length in meters; a special floating point type.
• TYPE_KILOMETERS A length in kilometers; a special floating point type.

These could be mapped to more relevant data types.

https://developers.google.com/analytics/devguides/reporting/data/v1/rest...

https://developers.google.com/analytics/devguides/reporting/data/v1/rest...

Steps to reproduce

Proposed resolution

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• ❌ Release

API changes

• N/A

Data model changes

• N/A

Release notes snippet

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