ProgramMemory refactor - eliminate copies of memory (#5273)

* refactor program memory for encapsulation and remove special treatment of return values

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor ProgramMemory to isolate mutation

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Refactor ProgramMemory

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Generated output

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Cache the result of executing modules for their items

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Compress envs when popped

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Remove the last traces of geometry from the memory module

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* docs

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fixups

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Frontend

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Improve Environment GC

Signed-off-by: Nick Cameron <nrc@ncameron.org>

* Fixup mock execution frontend and interpreter, misc bug fixes

Signed-off-by: Nick Cameron <nrc@ncameron.org>

---------

Signed-off-by: Nick Cameron <nrc@ncameron.org>

src/lang/std/sketchConstraints.test.ts

@@ -53,7 +53,7 @@ async function testingSwapSketchFnCall({
     return Promise.reject(new Error('transformInfos undefined'))
   const ast2 = transformAstSketchLines({
     ast,
-    programMemory: execState.memory,
+    memVars: execState.variables,
     selectionRanges: selections,
     transformInfos,
     referenceSegName: '',
@@ -373,7 +373,7 @@ part001 = startSketchOn('XY')
     const execState = await enginelessExecutor(assertParse(code))
     const index = code.indexOf('// normal-segment') - 7
     const sg = sketchFromKclValue(
-      execState.memory.get('part001'),
+      execState.variables['part001'],
       'part001'
     ) as Sketch
     const _segment = getSketchSegmentFromSourceRange(
@@ -393,7 +393,7 @@ part001 = startSketchOn('XY')
     const execState = await enginelessExecutor(assertParse(code))
     const index = code.indexOf('// segment-in-start') - 7
     const _segment = getSketchSegmentFromSourceRange(
-      sketchFromKclValue(execState.memory.get('part001'), 'part001') as Sketch,
+      sketchFromKclValue(execState.variables['part001'], 'part001') as Sketch,
       topLevelRange(index, index)
     )
     if (err(_segment)) throw _segment