gh-97669: Create Tools/build/ directory (#97963)

Create Tools/build/ directory. Move the following scripts from
Tools/scripts/ to Tools/build/:

* check_extension_modules.py
* deepfreeze.py
* freeze_modules.py
* generate_global_objects.py
* generate_levenshtein_examples.py
* generate_opcode_h.py
* generate_re_casefix.py
* generate_sre_constants.py
* generate_stdlib_module_names.py
* generate_token.py
* parse_html5_entities.py
* smelly.py
* stable_abi.py
* umarshal.py
* update_file.py
* verify_ensurepip_wheels.py

Update references to these scripts.

.github/CODEOWNERS

@@ -55,7 +55,7 @@ Python/traceback.c            @iritkatriel
 /Lib/html/                    @ezio-melotti
 /Lib/_markupbase.py           @ezio-melotti
 /Lib/test/test_html*.py       @ezio-melotti
-/Tools/scripts/*html5*        @ezio-melotti
+/Tools/build/parse_html5_entities.py   @ezio-melotti
 
 # Import (including importlib).
 # Ignoring importlib.h so as to not get flagged on

.github/workflows/verify-ensurepip-wheels.yml

@@ -6,12 +6,12 @@ on:
     paths:
       - 'Lib/ensurepip/_bundled/**'
       - '.github/workflows/verify-ensurepip-wheels.yml'
-      - 'Tools/scripts/verify_ensurepip_wheels.py'
+      - 'Tools/build/verify_ensurepip_wheels.py'
   pull_request:
     paths:
       - 'Lib/ensurepip/_bundled/**'
       - '.github/workflows/verify-ensurepip-wheels.yml'
-      - 'Tools/scripts/verify_ensurepip_wheels.py'
+      - 'Tools/build/verify_ensurepip_wheels.py'
 
 permissions:
   contents: read
@@ -29,4 +29,4 @@ jobs:
         with:
           python-version: '3'
       - name: Compare checksums of bundled pip and setuptools to ones published on PyPI
-        run: ./Tools/scripts/verify_ensurepip_wheels.py
+        run: ./Tools/build/verify_ensurepip_wheels.py