[pkgs/peggy] unify arguments to peggy parser (#145585)

We're getting closer to building peggy outside of bazel, and would like
to make configuring peggy something that is file-specific and not done
by configuring a peggy cli flag. This pr moves the config to
`${basename}.config.json` and then loads that in the cli instead. Down
the road we'll be able to write wrappers around the peggy compiler which
automatically picks up that file when it's located right next to the
grammar.

packages/kbn-es-query/BUILD.bazel

@@ -62,12 +62,13 @@ TYPES_DEPS = [
 peggy(
   name = "grammar",
   data = [
-    ":grammar/grammar.peggy"
+    ":grammar/grammar.peggy",
+    ":grammar/grammar.config.json"
   ],
   output_dir = True,
   args = [
-    "--allowed-start-rules",
-    "start,Literal",
+    "--extra-options-file",
+    "./%s/grammar/grammar.config.json" % package_name(),
     "-o",
     "$(@D)/built_grammar.js",
     "./%s/grammar/grammar.peggy" % package_name()

packages/kbn-es-query/grammar/grammar.config.json

@@ -0,0 +1,3 @@
+{
+  "allowedStartRules": ["start", "Literal"]
+}

packages/kbn-interpreter/BUILD.bazel

@@ -66,12 +66,13 @@ jsts_transpiler(
 peggy(
   name = "grammar",
   data = [
+    ":grammar/grammar.config.json",
     ":grammar/grammar.peggy"
   ],
   output_dir = True,
   args = [
-    "--allowed-start-rules",
-    "expression,argument",
+    "--extra-options-file",
+    "./%s/grammar/grammar.config.json" % package_name(),
     "-o",
     "$(@D)/built_grammar.js",
     "./%s/grammar/grammar.peggy" % package_name()

packages/kbn-interpreter/grammar/grammar.config.json

@@ -0,0 +1,3 @@
+{
+  "allowedStartRules": ["expression", "argument"]
+}