[mlir][Python] Add filegroup for files in mlir/extras.

This is needed after 225648e91c

utils/bazel/llvm-project-overlay/mlir/python/BUILD.bazel

@@ -46,6 +46,13 @@ filegroup(
     ],
 )
 
+filegroup(
+    name = "ExtrasPyFiles",
+    srcs = glob([
+        "mlir/extras/*.py",
+    ]),
+)
+
 filegroup(
     name = "IRPyIFiles",
     srcs = [
@@ -124,7 +131,6 @@ filegroup(
     ],
 )
 
-
 ##---------------------------------------------------------------------------##
 # Builtin dialect.
 ##---------------------------------------------------------------------------##
@@ -332,7 +338,7 @@ filegroup(
 gentbl_filegroup(
     name = "ArithOpsPyGen",
     tbl_outs = [
-       (
+        (
             [
                 "-gen-python-enum-bindings",
                 "-bind-dialect=arith",
@@ -506,7 +512,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/MathOps.td",
     deps = [
-               "//mlir:MathOpsTdFiles",
+        "//mlir:MathOpsTdFiles",
         "//mlir:OpBaseTdFiles",
     ],
 )
@@ -537,7 +543,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/MemRefOps.td",
     deps = [
-         "//mlir:MemRefOpsTdFiles",
+        "//mlir:MemRefOpsTdFiles",
         "//mlir:OpBaseTdFiles",
     ],
 )
@@ -568,7 +574,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/MLProgramOps.td",
     deps = [
-                "//mlir:MLProgramOpsTdFiles",
+        "//mlir:MLProgramOpsTdFiles",
         "//mlir:OpBaseTdFiles",
     ],
 )
@@ -630,7 +636,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/PDLOps.td",
     deps = [
-         "//mlir:OpBaseTdFiles",
+        "//mlir:OpBaseTdFiles",
         "//mlir:PDLDialectTdFiles",
     ],
 )
@@ -907,7 +913,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/SCFOps.td",
     deps = [
-          "//mlir:OpBaseTdFiles",
+        "//mlir:OpBaseTdFiles",
         "//mlir:SCFTdFiles",
     ],
 )
@@ -938,7 +944,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/ShapeOps.td",
     deps = [
-         "//mlir:OpBaseTdFiles",
+        "//mlir:OpBaseTdFiles",
         "//mlir:ShapeOpsTdFiles",
     ],
 )
@@ -979,7 +985,7 @@ gentbl_filegroup(
     tblgen = "//mlir:mlir-tblgen",
     td_file = "mlir/dialects/FuncOps.td",
     deps = [
-               "//mlir:FuncTdFiles",
+        "//mlir:FuncTdFiles",
         "//mlir:OpBaseTdFiles",
     ],
 )
@@ -1126,7 +1132,6 @@ filegroup(
 # Transform dialect and extensions.
 ##---------------------------------------------------------------------------##
 
-
 gentbl_filegroup(
     name = "TransformEnumPyGen",
     tbl_outs = [
@@ -1205,8 +1210,8 @@ gentbl_filegroup(
     deps = [
         "//mlir:CallInterfacesTdFiles",
         "//mlir:FunctionInterfacesTdFiles",
-        "//mlir:OpBaseTdFiles",
         "//mlir:GPUTransformOpsTdFiles",
+        "//mlir:OpBaseTdFiles",
         "//mlir:TransformDialectTdFiles",
     ],
 )
@@ -1250,9 +1255,9 @@ gentbl_filegroup(
     deps = [
         "//mlir:CallInterfacesTdFiles",
         "//mlir:FunctionInterfacesTdFiles",
+        "//mlir:LinalgTransformOpsTdFiles",
         "//mlir:OpBaseTdFiles",
         "//mlir:TransformDialectTdFiles",
-        "//mlir:LinalgTransformOpsTdFiles",
     ],
 )
 
@@ -1274,8 +1279,8 @@ gentbl_filegroup(
         "//mlir:CallInterfacesTdFiles",
         "//mlir:FunctionInterfacesTdFiles",
         "//mlir:OpBaseTdFiles",
-        "//mlir:TransformDialectTdFiles",
         "//mlir:SCFTransformOpsTdFiles",
+        "//mlir:TransformDialectTdFiles",
     ],
 )
 
@@ -1419,7 +1424,6 @@ gentbl_filegroup(
     ],
 )
 
-
 filegroup(
     name = "TransformOpsPyFiles",
     srcs = [