Implement the CSET machine, along with macros

[s-kybound]

Description

This PR introduces the T component to the CSE machine, which tracks a set of transformers with which we can use to expand macros into simpler forms. This enables the Scheme language to use macros in Source Academy

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code quality improvements

Checklist

• I have tested this code
• I have updated the documentation

[coveralls]

Pull Request Test Coverage Report for Build 11929582114

Details

• 491 of 596 (82.38%) changed or added relevant lines in 11 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.04%) to 81.654%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/createContext.ts	5	6	83.33%
src/cse-machine/utils.ts	31	32	96.88%
src/cse-machine/continuations.ts	10	13	76.92%
src/cse-machine/interpreter.ts	47	50	94.0%
src/cse-machine/macro-utils.ts	29	36	80.56%
src/cse-machine/scheme-macros.ts	189	199	94.97%
src/cse-machine/patterns.ts	166	246	67.48%

Files with Coverage Reduction	New Missed Lines	%
src/cse-machine/utils.ts	1	91.65%

Totals
Change from base Build 11907028652:	0.04%
Covered Lines:	11474
Relevant Lines:	13663

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💛 - Coveralls