Fix Functionary V3.2 parser: handle first tool call without >>> prefix
The template's generation prompt includes >>>, so the delta for the first
tool call doesn't have the >>> prefix. This commit:
- Splits tool call handling into first_tool_call (no >>>) and subsequent_tool_call (with >>>)
- Adds empty TOOL_OPEN tag for first tool to create tool call object
- Updates grammar to match first tool without >>>, subsequent tools with >>>
- Supports both "with content" (all\n...) and "without content" patterns
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>