Add ability to create named constant without code (#5840)

* Add support for forcing kcl input create variable

* Command palette padding tweak

* Make traverse function work for ExpressionStatements

* Add utilities for getting earliest safe index in AST

* Fix the insertIndex logic to not be based on the selection anymore

* Add workflow to create a named constant

* Fix bug with nameEndInDigits matcher

* Tweak command config

* Add a three-dot menu to feature tree pane to create parameters

* Add E2E test for create parameter flow

* Remove edit flow oops

* Fix tsc error

* Fix E2E test

* Update named constant position in edit flow test

* Add tags into consideration for safe insert index

Per @Irev-dev's helpful feedback, with unit tests!

src/lang/queryAst/getIdentifiersInProgram.test.ts

@@ -0,0 +1,44 @@
+import { assertParse, initPromise } from 'lang/wasm'
+import { getIdentifiersInProgram } from './getIndentifiersInProgram'
+
+function identifier(name: string, start: number, end: number) {
+  return {
+    type: 'Identifier',
+    name,
+    start,
+    end,
+  }
+}
+
+beforeAll(async () => {
+  await initPromise
+})
+
+describe(`getIdentifiersInProgram`, () => {
+  it(`finds no identifiers in an empty program`, () => {
+    const identifiers = getIdentifiersInProgram(assertParse(''))
+    expect(identifiers).toEqual([])
+  })
+  it(`finds a single identifier in an expression`, () => {
+    const identifiers = getIdentifiersInProgram(assertParse('55 + a'))
+    expect(identifiers).toEqual([identifier('a', 5, 6)])
+  })
+  it(`finds multiple identifiers in an expression`, () => {
+    const identifiers = getIdentifiersInProgram(assertParse('a + b + c'))
+    expect(identifiers).toEqual([
+      identifier('a', 0, 1),
+      identifier('b', 4, 5),
+      identifier('c', 8, 9),
+    ])
+  })
+  it(`finds all the identifiers in a normal program`, () => {
+    const program = assertParse(`x = 5 + 2
+y = x * 2
+z = y + 1`)
+    const identifiers = getIdentifiersInProgram(program)
+    expect(identifiers).toEqual([
+      identifier('x', 14, 15),
+      identifier('y', 24, 25),
+    ])
+  })
+})