Implement statement sequence for the CSE machine

[NhatMinh0208]

Description

This PR implements statement sequences for the CSE machine, as described in #1580. It introduces a new node type, StatementSequence, an AST transformer that converts BlockStatements and Programs without declarations into StatementSequences and adds logic to the CSE machine interpreter to handle the new node type.

Changes

• [X] Add StatementSequence
• [X] Replace es.Node with custom Node type that includes StatementSequence
• [X] Add an AST transformer that converts BlockStatements without declarations into StatementSequences
• [X] Add logic to interpreter to handle StatementSequence
• [X] Modify astToString to work with StatementSequence (for frontend)

[coveralls]

Pull Request Test Coverage Report for Build 8344121055

Details

• 152 of 298 (51.01%) changed or added relevant lines in 46 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.7%) to 81.196%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/errors/moduleErrors.ts	1	2	50.0%
src/modules/errors.ts	1	2	50.0%
src/name-extractor/index.ts	2	3	66.67%
src/stdlib/parser.ts	1	2	50.0%
src/typeChecker/internalTypeErrors.ts	0	1	0.0%
src/errors/errors.ts	7	10	70.0%
src/cse-machine/utils.ts	25	30	83.33%
src/errors/typeErrors.ts	0	6	0.0%
src/utils/statementSeqTransform.ts	18	145	12.41%
<!--	Total:	152	298	51.01%	-->

Files with Coverage Reduction	New Missed Lines	%
src/utils/astCreator.ts	1	82.52%
src/cse-machine/utils.ts	1	86.19%
<!--	Total:	2		-->

Totals
Change from base Build 8337328960:	-0.7%
Covered Lines:	10402
Relevant Lines:	12398

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💛 - Coveralls

[NhatMinh0208]

wow that somehow caused zero regression

[NhatMinh0208]

Barring any bugs that are not covered by tests, the CSE machine integration of StatementSequence is now complete.