Reporting rules should allow multiple inputs

[hugohills-regnosys]

The limitation that reporting rules only support a single input causes problems with repeatable rules if the rule requirements multiple inputs.

Repeating rule:

extract enclosingRuleInput [ fooList
    then extract
        FooReport {
            attr1: Attr1Rule, // single input "item" to Attr1Rule  
            attr2: Attr2Func(item, inputType // 2 inputs, "item" and "enclosingRuleInput", for Attr2Func , so unable to use a rule
        }
]

Repeating rule returns a list of FooReport. Each attribute has a rule reference.

type FooReport:
    attr1 string (0..1)
        [ruleReference Attr1Rule]
    attr2 string (0..1)
        [ruleReference Attr2Rule] // rule specified here used for regulatoryReference and "as" rule name, but not extract logic

Rules

reporting rule Attr1Rule from Foo:
    [regulatoryReference "blah blah blah reg reference for Attr1Rule"]
    extract item -> attr1
    as "Foo attr1 rule name"

reporting rule Attr2Rule from Foo:
    [regulatoryReference "blah blah blah reg reference for Attr2Rule"] // this is used in regulation
    empty // unreachable / unused extract code
    as "Foo attr2 rule name" // this used in tabulation