Allow defining built-ins types and functions only inside relevant contexts

[ggiraldez]

The changes in this PR would allow us to remove all Yul keywords defined for built-ins and declare them as built-ins, to be bound only in assembly statements context. This would simplify the language grammar.

• add BuiltInContext to separate built-ins.
• delete YulBuiltInFunction, and merge its children with the newly created BuiltInContext(name = "$YulBuiltIns$").
• add snapshot tests to make sure they are still bound correctly in Yul.
• add snapshot tests to make sure Solidity built-ins are only bound inside Solidity, and vise-versa.

[changeset-bot]

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Latest commit: 102809c

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