Add third party connectors source-kelkoo and source-criteo (#239)

airbyte-integrations/third-party/gjbakerross/README.md

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+## Building
+
+These connectors are based on `source-criteo`/`source-kelkoo` from `gjbakerross`. The upstream sources including `Dockerfile` can be found here:
+* https://github.com/gjbakerross/airbyte-source-criteo
+* https://github.com/gjbakerross/airbyte-source-kelkoo
+
+We build those repositories and push the artifacts to `ghcr.io/estuary/gjbakerross/source-criteo`/`source-kelkoo` with the following command:
+
+```
+docker buildx build --no-cache --platform linux/amd64 https://github.com/gjbakerross/airbyte-source-criteo.git -t ghcr.io/estuary/gjbakerross/source-criteo:dev --push
+```

airbyte-integrations/third-party/gjbakerross/airbyte-source-criteo/Dockerfile

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+ARG AIRBYTE_TO_FLOW_TAG="dev"
+FROM ghcr.io/estuary/airbyte-to-flow:$AIRBYTE_TO_FLOW_TAG as airbyte-to-flow
+
+FROM ghcr.io/estuary/gjbakerross/source-criteo:dev
+
+COPY *.json ./
+RUN mkdir -p ./streams
+COPY streams/* ./streams
+
+COPY --from=airbyte-to-flow /airbyte-to-flow ./
+ENTRYPOINT ["/airbyte/integration_code/airbyte-to-flow", "--connector-entrypoint", "python /airbyte/integration_code/main.py"]
+
+LABEL io.airbyte.version=v1
+LABEL io.airbyte.name=estuary/source-criteo
+LABEL FLOW_RUNTIME_PROTOCOL=capture
+LABEL CONNECTOR_PROTOCOL=flow-capture
+LABEL FLOW_RUNTIME_CODEC=json

airbyte-integrations/third-party/gjbakerross/airbyte-source-kelkoo/Dockerfile

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+ARG AIRBYTE_TO_FLOW_TAG="dev"
+FROM ghcr.io/estuary/airbyte-to-flow:$AIRBYTE_TO_FLOW_TAG as airbyte-to-flow
+
+FROM ghcr.io/estuary/gjbakerross/source-kelkoo:dev
+
+COPY *.json ./
+RUN mkdir -p ./streams
+COPY streams/* ./streams
+
+COPY --from=airbyte-to-flow /airbyte-to-flow ./
+ENTRYPOINT ["/airbyte/integration_code/airbyte-to-flow", "--connector-entrypoint", "python /airbyte/integration_code/main.py"]
+
+LABEL io.airbyte.version=v1
+LABEL io.airbyte.name=estuary/source-kelkoo
+LABEL FLOW_RUNTIME_PROTOCOL=capture
+LABEL CONNECTOR_PROTOCOL=flow-capture
+LABEL FLOW_RUNTIME_CODEC=json