BaseTools/Plugin/CodeQL: Add integration helpers

Adds a Python module to the CodeQL plugin directory that exports
functions commonly needed for Stuart-based platforms to easily
enable CodeQL in their platform build.

This functionality has already moved to edk2-pytool-extensions
https://github.com/tianocore/edk2-pytool-extensions in the
`edk2toolext/codeql.py` file but edk2 is too far behind to use that.

Additional integration changes are needed in edk2 and the series
to add those has not made it past review. In the meantime, the
functions are available locally in this commit and this commit can
be reverted after edk2-pytool-extensions 0.24.1 or greater is used
in edk2.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Sean Brogan <sean.brogan@microsoft.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>

BaseTools/Plugin/CodeQL/integration/stuart_codeql.py

@@ -0,0 +1,79 @@
+# @file stuart_codeql.py
+#
+# Exports functions commonly needed for Stuart-based platforms to easily
+# enable CodeQL in their platform build.
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+from edk2toolext.environment.uefi_build import UefiBuilder
+from edk2toollib.utility_functions import GetHostInfo
+from argparse import ArgumentParser, Namespace
+from typing import Tuple
+
+
+def add_command_line_option(parser: ArgumentParser) -> None:
+    """Adds the CodeQL command to the platform command line options.
+
+    Args:
+        parser (ArgumentParser): The argument parser used in this build.
+
+    """
+    parser.add_argument(
+        '--codeql',
+        dest='codeql',
+        action='store_true',
+        default=False,
+        help="Optional - Produces CodeQL results from the build. See "
+             "BaseTools/Plugin/CodeQL/Readme.md for more info.")
+
+
+def get_scopes(codeql_enabled: bool) -> Tuple[str]:
+    """Returns the active CodeQL scopes for this build.
+
+    Args:
+        codeql_enabled (bool): Whether CodeQL is enabled.
+
+    Returns:
+        Tuple[str]: A tuple of strings containing scopes that enable the
+                    CodeQL plugin.
+    """
+    active_scopes = ()
+
+    if codeql_enabled:
+        if GetHostInfo().os == "Linux":
+            active_scopes += ("codeql-linux-ext-dep",)
+        else:
+            active_scopes += ("codeql-windows-ext-dep",)
+        active_scopes += ("codeql-build", "codeql-analyze")
+
+    return active_scopes
+
+
+def is_codeql_enabled_on_command_line(args: Namespace) -> bool:
+    """Returns whether CodeQL was enabled on the command line.
+
+    Args:
+        args (Namespace): Object holding a string representation of command
+                          line arguments.
+
+    Returns:
+        bool: True if CodeQL is enabled on the command line. Otherwise, false.
+    """
+    return args.codeql
+
+
+def set_audit_only_mode(uefi_builder: UefiBuilder) -> None:
+    """Configures the CodeQL plugin to run in audit only mode.
+
+    Args:
+        uefi_builder (UefiBuilder): The UefiBuilder object for this platform
+                                    build.
+
+    """
+
+    uefi_builder.env.SetValue(
+        "STUART_CODEQL_AUDIT_ONLY",
+        "true",
+        "Platform Defined")