Fix a number of errors in loops#308

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Mingun wants to merge 17 commits intokaitai-io:masterfrom

Commits on Dec 24, 2025

Document `_currentIteratorType` and `_currentSwitchType` fields
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Raise human-readable error in case of incorrect usage of `_on` or `_` special variables in expressions
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Perl: Remove excess set of `_currentSwitchType`, it is already set in `SwitchIfOps.switchCases`
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Move set of type of `_` from each compiler implementation to the common place
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Rust: Remove unnecessary set of type of `_` variable, it is already set in `CommonReads.attrParse0`
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Rust: no need to check that type of `_` is defined, it MUST be defined here
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Set type of `_` for type validation only in `repeat-until` loops where it only can be used
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Rename _currentIteratorType -> _typeOfUnderscore
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Use Identifier.ITERATOR instead of "_"
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Remove unused parameters from `condRepeatUntilHeader` and `condRepeatUntilFooter`
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Document `condRepeatUntilHeader` and `condRepeatUntilFooter` methods
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Fix inconsistency in values of `_index` variable in loops
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Always calculate count of iterations only once in `repeat-expr` loops
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Remove unused parameters from `condRepeatExprHeader` and document `condRepeatExprHeader` and `condRepeatExprFooter`
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Perl: declare `_index` variable in `repeat: eos` loops
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Go, Rust: Fix usage of incorrect stream in `repeat: eos` loops when `_io` is redefined
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Remove unused parameters from `condRepeatEosHeader` and document `condRepeatEosHeader` and `condRepeatEosFooter`
Mingun
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