.github: Add initial CodeQL config and workflow files

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=4115

Adds initial support for enabling CodeQL Code Scanning in this
repository per the RFC:

  https://github.com/tianocore/edk2/discussions/3258

Adds the following new files:
  - .github/workflows/codql-analysis.yml - The main GitHub workflow
    file used to setup CodeQL in the repo.
  - .github/codeql/codeql-config.yml - The main CodeQL configuration
    file used to customize the queries and other resources the repo
    is using for CodeQL.
  - edk2.qls - A query set of queries to run for CodeQL.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

.github/codeql/codeql-config.yml

@@ -0,0 +1,30 @@
+## @file
+# CodeQL configuration file for edk2.
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+name: "CodeQL config"
+
+# The following line disables the default queries. This is used because we want to enable on query at a time by
+# explicitly specifying each query in a "queries" array as they are enabled.
+#
+# See the following for more information about adding custom queries:
+# https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning#using-a-custom-configuration-file
+
+#disable-default-queries: true
+
+queries:
+  - name: EDK2 CodeQL Query List
+    uses: ./.github/codeql/edk2.qls
+
+# We must specify a query for CodeQL to run. Until the first query is enabled, enable the security query suite but
+# exclude all problem levels from impacting the results. After the first query is enabled, this filter can be relaxed
+# to find the level of problems desired from the query.
+query-filters:
+- exclude:
+    problem.severity:
+      - error
+      - warning
+      - recommendation