Add DynamicGroup support to goby_clang_tool viz

[Copilot]

goby_clang_tool -gen only matched static publish/subscribe calls (compile-time constexpr Group template args), silently ignoring publish_dynamic/subscribe_dynamic calls that use DynamicGroup. This meant any application using runtime groups was invisible in the generated diagrams.

Changes

generate.cpp — new pubsub_dynamic_matcher()

• Adds a Clang AST matcher for publish_dynamic<Data, scheme>(data, DynamicGroup("str")) and subscribe_dynamic<Data, scheme>(cb, DynamicGroup("str"))
• Extracts group name when statically determinable: inline DynamicGroup("literal") and variables initialized from one; silently skips truly runtime-computed groups
• Note: template arg layout differs from static variants — [0]=Data, [1]=scheme vs [0]=group, [1]=Data, [2]=scheme
• Registers matchers alongside existing static ones; is_dynamic set via exact method name check

// Previously invisible to the tool; now captured:
interprocess().publish_dynamic<NavMsg>(data, goby::middleware::DynamicGroup("navigation"));

DynamicGroup stored_group("status");
interthread().subscribe_dynamic<StatusMsg>(cb, stored_group);

pubsub_entry.h — is_dynamic field

• Adds bool is_dynamic{false} to PubSubEntry
• Round-trips through YAML (is_dynamic: true emitted/parsed only when set)
• Constructor extended with bool dynamic = false default arg (ABI-safe for existing callers)

visualize.cpp — visual distinction

• dynamic_style = "dashed" for dynamic group edges (complements existing solid/bold/tapered/dotted)
• connection_with_label_final() applies dashed style and appends [dynamic] to the hover tooltip when is_dynamic is set
• is_dynamic propagated through connection_with_label(), disconnected_publication(), and disconnected_subscription() via the PubSubEntry objects — no signature changes to call sites

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add dynamic groups to goby_clang_tool viz</issue_title>
<issue_description>As much as possible, it would be great to support DynamicGroups in the visualization tool.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add dynamic groups to goby_clang_tool viz #343

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