Add Oboe as submodule to use as backend

Author: alexytomi

.github/workflows/ci.yml

@@ -76,6 +76,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
       with:
+        submodules: 'true'
         fetch-depth: '0'
 
     - name: Get current commit tag, short hash, count and date

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "oboe"]
+	path = oboe
+	url = https://github.com/google/oboe.git