Add some types to keyboard grammar (#2435)

## Checklist

- [-] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [-] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [-] I have not broken the cheatsheet

Author: pokey

packages/cursorless-vscode/src/keyboard/grammar/generated/grammar.ts

@@ -23,6 +23,7 @@ declare var digit: any;
 import { capture, UNUSED as _, argPositions } from "@cursorless/cursorless-engine"
 import { command } from "../command"
 import { keyboardLexer } from "../keyboardLexer";
+import { RelativeScopeModifier } from "@cursorless/common";
 
 const { $0, $1, $2 } = argPositions;
 
@@ -93,7 +94,7 @@ const grammar: Grammar = {
     {"name": "modifier$ebnf$2", "symbols": ["number"], "postprocess": id},
     {"name": "modifier$ebnf$2", "symbols": [], "postprocess": () => null},
     {"name": "modifier", "symbols": ["modifier$ebnf$1", (keyboardLexer.has("nextPrev") ? {type: "nextPrev"} : nextPrev), "modifier$ebnf$2", "scopeType"], "postprocess": 
-        ([offset, _, length, scopeType]) => ({
+        ([offset, _, length, scopeType]): RelativeScopeModifier => ({
           type: "relativeScope",
           offset: offset?.number ?? 1,
           direction: offset?.direction ?? "forward",
@@ -102,7 +103,7 @@ const grammar: Grammar = {
         })
         },
     {"name": "modifier", "symbols": ["offset", "scopeType"], "postprocess": 
-        ([offset, scopeType]) => ({
+        ([offset, scopeType]): RelativeScopeModifier => ({
           type: "relativeScope",
           offset: 0,
           direction: offset?.direction ?? "forward",

packages/cursorless-vscode/src/keyboard/grammar/grammar.ne

@@ -3,6 +3,7 @@
 import { capture, UNUSED as _, argPositions } from "@cursorless/cursorless-engine"
 import { command } from "../command"
 import { keyboardLexer } from "../keyboardLexer";
+import { RelativeScopeModifier } from "@cursorless/common";
 
 const { $0, $1, $2 } = argPositions;
 %}
@@ -68,7 +69,7 @@ modifier -> %every scopeType {% capture({ type: "everyScope", scopeType: $1 }) %
 # "[third] next [two] funks"
 # "[third] previous [two] funks"
 modifier -> offset:? %nextPrev number:? scopeType {%
-  ([offset, _, length, scopeType]) => ({
+  ([offset, _, length, scopeType]): RelativeScopeModifier => ({
     type: "relativeScope",
     offset: offset?.number ?? 1,
     direction: offset?.direction ?? "forward",
@@ -79,7 +80,7 @@ modifier -> offset:? %nextPrev number:? scopeType {%
 
 # "three funks [backward]"
 modifier -> offset scopeType {%
-  ([offset, scopeType]) => ({
+  ([offset, scopeType]): RelativeScopeModifier => ({
     type: "relativeScope",
     offset: 0,
     direction: offset?.direction ?? "forward",