feat(go): Add ext golang pack

Author: GeekMasher

go/ext/codeql-pack.lock.yml

@@ -0,0 +1,4 @@
+---
+lockVersion: 1.0.0
+dependencies: {}
+compiled: false

go/ext/generated/.gitkeep

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+extensions:
+  # Make sure that the extensible model predicates are at least defined as empty.
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sourceModel
+    data:
+      - ["flag", "", True, "String", "", "", "ReturnValue[0]", "remote", "manual"]
+      - ["flag", "", True, "StringVar", "", "", "ReturnValue[0]", "remote", "manual"]
+      # local variants
+      - ["flag", "", True, "String", "", "", "ReturnValue[0]", "local", "manual"]
+      - ["flag", "", True, "StringVar", "", "", "ReturnValue[0]", "local", "manual"]
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sinkModel
+    data: []
+  - addsTo:
+      pack: codeql/go-all
+      extensible: summaryModel
+    data: []

go/ext/manual/.gitkeep

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+extensions:
+  # Make sure that the extensible model predicates are at least defined as empty.
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sourceModel
+    data:
+      - ["os", "Args", True, "", "", "", "ReturnValue[0]", "remote", "manual"]
+      - ["os", "", True, "Getenv", "", "", "ReturnValue[0]", "remote", "manual"]
+      - ["os", "", True, "Environ", "", "", "ReturnValue[0]", "remote", "manual"]
+      # local variants
+      - ["os", "Args", True, "", "", "", "ReturnValue[0]", "local", "manual"]
+      - ["os", "", True, "Getenv", "", "", "ReturnValue[0]", "local", "manual"]
+      - ["os", "", True, "Environ", "", "", "ReturnValue[0]", "local", "manual"]
+  - addsTo:
+      pack: codeql/go-all
+      extensible: sinkModel
+    data: []
+  - addsTo:
+      pack: codeql/go-all
+      extensible: summaryModel
+    data: []

go/ext/manual/flag.yml

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+library: true
+name: githubsecuritylab/codeql-go-extensions
+version: 0.0.1
+extensionTargets:
+  codeql/go-all: '*'
+dataExtensions:
+  - 'manual/*.yml'
+  - 'manual/**/*.yml'
+  - 'generated/*.yml'
+  - 'generated/**/*.yml'