BinToPcd.py: Update regex strings to use raw strings (#604)

With Python 3.12 invalid escape sequences now generate warning messages.
This change fixes the problem exposed by the warning message.
```
INFO - mu_basecore\BaseTools\Scripts\BinToPcd.py:40: SyntaxWarning: invalid escape sequence '\_'
INFO -   if re.split ('[a-zA-Z\_][a-zA-Z0-9\_]*\.[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
INFO - mu_basecore\BaseTools\Scripts\BinToPcd.py:46: SyntaxWarning: invalid escape sequence '\_'
INFO -   if re.split ('[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
```

Additional updates:
* run isort
* removed trailing whitespace

- [ ] Impacts functionality?
- **Functionality** - Does the change ultimately impact how firmware
functions?
- Examples: Add a new library, publish a new PPI, update an algorithm,
...
- [ ] Impacts security?
- **Security** - Does the change have a direct security impact on an
application,
    flow, or firmware?
  - Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
- [ ] Breaking change?
- **Breaking change** - Will anyone consuming this change experience a
break
    in build or boot behavior?
- Examples: Add a new library class, move a module to a different repo,
call
    a function in a new library class in a pre-existing module, ...
- [ ] Includes tests?
  - **Tests** - Does the change include any explicit test code?
  - Examples: Unit tests, integration tests, robot tests, ...
- [ ] Includes documentation?
- **Documentation** - Does the change contain explicit documentation
additions
    outside direct code modifications (and comments)?
- Examples: Update readme file, add feature readme file, link to
documentation
    on an a separate Web page, ...

I verified that the Python 3.12 character invalid escape sequence print
is no longer output, and that the regex expression is still functioning
as expected.

N/A

BaseTools/Scripts/BinToPcd.py

@@ -38,13 +38,15 @@ def ValidateUnsignedInteger (Argument):
         return Value
 
     def ValidatePcdName (Argument):
-        if re.split ('[a-zA-Z\_][a-zA-Z0-9\_]*\.[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
+        # MU_CHANGE: make regex string a raw string
+        if re.split (r'[a-zA-Z\_][a-zA-Z0-9\_]*\.[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
             Message = '{Argument} is not in the form <PcdTokenSpaceGuidCName>.<PcdCName>'.format (Argument = Argument)
             raise argparse.ArgumentTypeError (Message)
         return Argument
 
     def ValidateGuidName (Argument):
-        if re.split ('[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
+        # MU_CHANGE: make regex string a raw string
+        if re.split (r'[a-zA-Z\_][a-zA-Z0-9\_]*', Argument) != ['', '']:
             Message = '{Argument} is not a valid GUID C name'.format (Argument = Argument)
             raise argparse.ArgumentTypeError (Message)
         return Argument