Test definiens cursors and verify that all identifiers are bound

[ggiraldez]

Closes #1191
Closes #1199

• Add output of definiens cursors in all bindings snapshots
• Check all Identifier and YulIdentifier nodes are bound to a reference or definition (except those under ExperimentalFeature) in snapshots
• Fix missing binding for catch clauses: the identifiers there can only be Error or Panic, but they are still parsed as identifiers (maybe it's better to add them as keywords?). Also added them as error definitions in built-ins.
• Relax modifier definition rules to bind the name identifier even if failing to parse the body.

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