Add psalm annotations

• Fix all issues found by psalm
• Increase type specificity
• Add @psalm-pure
• Add @psalm-assert
• Add proper support for more complex cases like compose

Type specificity

• Average
• ButLast
• Capture
• CompareObjectHashOn
• CompareOn
• Compose
• Concat
• ConstFunction
• Contains
• Converge
• Curry
• CurryN
• Difference
• DropFirst
• DropLast
• Each
• Equal
• ErrorToException
• Every
• Exceptions/InvalidArgumentException
• Exceptions/MatchException
• False
• Falsy
• Filter
• First
• FirstIndexOf
• FlatMap
• Flatten
• Flip
• Functional
• GreaterThan
• GreaterThanOrEqual
• Group
• Head
• Id
• Identical
• IfElse
• IndexesOf
• Intersperse
• Invoke
• InvokeFirst
• InvokeIf
• InvokeLast
• Invoker
• Last
• LastIndexOf
• LessThan
• LessThanOrEqual
• LexicographicCompare
• Map
• Match
• Maximum
• Memoize
• Minimum
• None
• Noop
• Not
• OmitKeys
• PartialAny
• PartialLeft
• PartialMethod
• PartialRight
• Partition
• Pick
• Pluck
• Poll
• Product
• Ratio
• ReduceLeft
• ReduceRight
• Reindex
• Reject
• Repeat
• Retry
• Select
• SelectKeys
• SequenceConstant
• SequenceExponential
• SequenceLinear
• Sequences/ExponentialSequence
• Sequences/LinearSequence
• Some
• Sort
• Sum
• SuppressError
• Tail
• TailRecursion
• TakeLeft
• TakeRight
• Tap
• True
• Truthy
• Unique
• With
• Zip
• ZipAll

Issues

• invoker(), invoke(), partial_method(): no way to annotate method names properly: Feature request: public-method-string<O> vimeo/psalm#2500
• Recursive types are not implemented (problem for compose, curry, etc.): Mixing templates and types seems to confuse psalm vimeo/psalm#2499