fix(rate-limit): do not store instances/defaultconfigs globally #90
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Originally this global map of httpclient instances -> default configs was necessary because of a bug in Axios 19.0 (The change to to SDK-core was added here). This bug was fixed in axios, so it's no longer necessary (axios/axios#2207).
We suspect this may be causing a memory leak, since this memory is never released.
Testing with the-example-app.nodejs locally, this change did improve the jsheapsize after garbage collection, so hopefully this helps our customers, too.