feat: add isAwait to ForOfStmt and isRest to ParameterDecl, fix TemplateExpr

[sam-goodwin]

Partial #374
Closes #397

Adds support for the following syntax:

• capture the const, let or var from a VariableDecl
• remove logic that normalized !== to != and === to ==
• add all missing Binary and Unary Operators https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators
• for-await-of

for await (const a of b)

• rest parameter declarations

function foo(...rest) {}

• refactor: remove redundant clone functions and add missing validation to nodes
• refactor TemplateExpr to use TemplateHead, TemplateSpan, TemplateMiddle, TemplateTail and remove QuasiString.
• add label to BreakStmt and ContinueStmt
• properly parse label in LabelledStmt, change label to be an Identiifer
• add expr to SwitchStmt
• update ReturnStmt.expr to be optional AST: ReturnStmt.expr should be optional #397

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[thantos]

Should we fail the transpiler when these flags are true?

[sam-goodwin]

Should we fail the transpiler when these flags are true?

Done.