add event node support

[daog1]

Summary

I added this while making dynamic-parsers support full Anchor-format parsing, and I want to upstream the base event support first so that work can stay aligned with main.

This PR adds EventNode support across the core packages and imports Anchor events into the program AST.

A follow-up change depends on this.

Changes

• add EventNode to node types and node constructors
• add ProgramNode.events
• import Anchor v0.1 events
• avoid duplicating event structs in definedTypes
• update core visitors for eventNode
• add tests

Validation

• pnpm lint
• pnpm test

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Latest commit: 536e25f

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