CSE Machine: `hasXStatement` fixes

[NhatMinh0208]

Description:

The functions hasContinueStatement, hasReturnStatement and hasBreakStatement are used to detect continue, return and break statements. These functions expect a block statement and recurse into if statements, meaning they fail on else if constructs since these constructs nest an if statement inside an if statement.

This PR adds variants of the above functions ( hasContinueStatementIf, hasReturnStatementIf and hasBreakStatementIf) so that else if constructs can now be properly recursed into.

Changes:

• [X] Add hasContinueStatementIf, hasReturnStatementIf and hasBreakStatementIf
• [X] Fix hasContinueStatement, hasReturnStatement and hasBreakStatement to work with else if constructs

[coveralls]

Pull Request Test Coverage Report for Build 7765429242

• -5 of 38 (86.84%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 83.043%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/cse-machine/utils.ts	33	38	86.84%
<!--	Total:	33	38	86.84%	-->

Totals
Change from base Build 7758878252:	0.002%
Covered Lines:	10926
Relevant Lines:	12732

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💛 - Coveralls