fix: cache Webhook dynamic import to avoid repeated import() calls

[mcollina]

Remove dynamic import of Webhook as it was showing up in flamegraphs.

[Copilot]

Pull request overview

This PR removes repeated import() overhead in storage event webhook dispatching by caching the dynamically imported Webhook class in BaseEvent, reducing runtime cost that was visible in flamegraphs.

Changes:

• Add a module-scoped cache for the Webhook export from ./lifecycle/webhook.
• Update BaseEvent.sendWebhook() to import Webhook only once and reuse it for subsequent calls.

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[coveralls]

Coverage Report for CI Build 24838264429

Coverage increased (+0.002%) to 69.946%

Details

• Coverage increased (+0.002%) from the base build.
• Patch coverage: 3 of 3 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	9692
Covered Lines:	7149
Line Coverage:	73.76%
Relevant Branches:	5414
Covered Branches:	3417
Branch Coverage:	63.11%
Branches in Coverage %:	Yes
Coverage Strength:	375.25 hits per line

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💛 - Coveralls