feat(sra_client.py)

* Code generation scripts

* Generated code

* Change test config to hit 0x-launch-kit

* Ran prettier on generated code

* First test case, of get_asset_pairs()

* Use launch kit docker image to faciliate CI tests

* Fix markdown rendering for GitHub and PyPI

* Add URL for PyPI to link back to GitHub

* Add one-line package description to README.md

* Remove git_push.sh

* Remove unimplemented tests

* Add sra_client to top-level README package list

* Remove repeated-everywhere long description

* Add shorcuts for publishing

* Remove TypeScript examples

python-packages/sra_client/generate.sh

@@ -0,0 +1,26 @@
+# This file provided not so much to be run but rather more for posterity, as a
+# record of how this generated code was produced.
+
+GENERATOR_JAR=http://central.maven.org/maven2/org/openapitools/openapi-generator-cli/3.3.4/openapi-generator-cli-3.3.4.jar
+GENERATOR_JAR_BASENAME=$(basename $GENERATOR_JAR)
+
+if [ -f $GENERATOR_JAR_BASENAME ]; then
+    if [ "$(openssl dgst -sha256 $GENERATOR_JAR_BASENAME)" \
+        != "SHA256($GENERATOR_JAR_BASENAME)= 24cb04939110cffcdd7062d2f50c6f61159dc3e0ca3b8aecbae6ade53ad3dc8c" \
+    ]; then
+        rm $GENERATOR_JAR_BASENAME
+    fi
+fi
+
+if [ ! -f $GENERATOR_JAR_BASENAME ]; then
+    wget $GENERATOR_JAR
+fi
+
+PYTHON_POST_PROCESS_FILE="black --line-length 79" \
+    java -jar openapi-generator-cli-3.3.4.jar \
+        generate \
+        --input-spec http://unpkg.com/@0x/sra-spec@1.0.11/lib/api.json \
+        --output . \
+        --generator-name python \
+        --config openapi-generator-cli-config.json \
+        --enable-post-process-file