Add config file for specifying backends

poetry.lock

@@ -62,7 +62,7 @@ optional = false
 python-versions = ">=3.5"
 
 [package.extras]
-screenshot_raw = ["pillow"]
+screenshot_raw = ["Pillow"]
 
 [[package]]
 name = "requests"
@@ -82,6 +82,14 @@ urllib3 = ">=1.21.1,<1.27"
 socks = ["PySocks (>=1.5.6,!=1.5.7)"]
 use_chardet_on_py3 = ["chardet (>=3.0.2,<6)"]
 
+[[package]]
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
 [[package]]
 name = "urllib3"
 version = "1.26.12"
@@ -98,7 +106,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "7e77956c19bb0148f37be8283857fbd29805184149d6f2c1027daab624c66b80"
+content-hash = "ab4b6be20253adf487e007f81b07f9f585bd4a61d4e51889f9356dfc0e03e206"
 
 [metadata.files]
 certifi = [
@@ -152,6 +160,10 @@ requests = [
     {file = "requests-2.28.1-py3-none-any.whl", hash = "sha256:8fefa2a1a1365bf5520aac41836fbee479da67864514bdb821f31ce07ce65349"},
     {file = "requests-2.28.1.tar.gz", hash = "sha256:7c5599b102feddaa661c826c56ab4fee28bfd17f5abca1ebbe3e7f19d7c97983"},
 ]
+toml = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
 urllib3 = [
     {file = "urllib3-1.26.12-py2.py3-none-any.whl", hash = "sha256:b930dd878d5a8afb066a637fbb35144fe7901e3b209d1cd4f524bd0e9deee997"},
     {file = "urllib3-1.26.12.tar.gz", hash = "sha256:3fa96cf423e6987997fc326ae8df396db2a8b7c667747d47ddd8ecba91f4a74e"},