Symbol Lookup Gem

A gemified version of the Symbol[str] method proposed in https://bugs.ruby-lang.org/issues/7854

 call-seq:
    Symbol.find str => Symbol or nil
    Symbol[str]   => Symbol or nil
    str.interned? => Symbol or nil
    str.to_existing_sym => Symbol or ArgumentError

Returns an extant symbol, which is the .to_sym of str, or nil if no such symbol exists.

Symbol.find 'Object' #=> :Object
Symbol.find 'none such' #=> nil
Symbol['Object'] #=> :Object
Symbol['none such'] #=> nil

'Object'.interned? #=> :Object
'none such'.interned? #=> nil

'Object'.to_existing_sym #=> :Object
'none such'.to_existing_sym #=> (raises ArgumentError)

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