Add 'PRODUCT_ANALYTICS' to SericeDomain enum

[EricGustin]

We will be adding some product analytics toolkits in the near future

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Note

Low Risk
Low risk: adds a new ServiceDomain enum value and bumps the package version, with minimal behavioral impact beyond any downstream enum matching/serialization expectations.

Overview
Adds ServiceDomain.PRODUCT_ANALYTICS ("product_analytics") to tool metadata classification to support upcoming product analytics integrations.

Bumps arcade-core version from 4.5.0 to 4.6.0.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
libs/arcade-core/arcade_core/metadata.py	100.00% <100.00%> (ø)

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[byrro]

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