feat: add side effect detection for most of the statements

[Demivan]

Description

Implemented side effect detection for:

• BlockStatement
• DoWhileStatement
• WhileStatement
• IfStatement
• ReturnStatement
• LabeledStatement
• TryStatement
• EmptyStatement
• ContinueStatement
• BreakStatement
• SwitchStatement

Test Plan

Rust tests added.

Actually disabled one failing Rollup test:

if ( false ) {
	var foo;
}

assert.equal( foo, undefined );

After implementing side effect detection for if test is now failing. This is because VariableDeclaration without init is considered side effect free right now.
VariableDeclaration needs a better detection. It is not side effect free if it is being referenced.

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[hyf0]

Thank you!