Bringing things to sdk-ts 1.5 parity#4

Merged

krider2010 merged 7 commits intomainfrom

claire/eng-191-python

Jul 13, 2025

Commits on Jul 12, 2025

Add metadata support to Event class

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Add AdminClient for push subscription management

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Add waitgroups support for coordinated event publishing

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Add SailhouseSubscriber for long-running event processing

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Add HMAC push subscription verification with security features

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Fix configurable API URL support in client methods

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Bump version to 1.5.0 to match sdk-ts

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