Amplitude-experiment

Fix

* Improve remote evaluation fetch retry logic ([42](https://github.com/amplitude/experiment-python-server/issues/42)) ([`4864666`](https://github.com/amplitude/experiment-python-server/commit/486466683d787de35fc8a442b0ac060078b4ad81))

Feature

* Evaluation v2 ([41](https://github.com/amplitude/experiment-python-server/issues/41)) ([`8a57489`](https://github.com/amplitude/experiment-python-server/commit/8a5748933e16ed59207b07b34124952872c42ad5))

Fix

* Memory leak from string cstring disposal ([40](https://github.com/amplitude/experiment-python-server/issues/40)) ([`93c647f`](https://github.com/amplitude/experiment-python-server/commit/93c647f4da429b75be6eea6c7611b771d4d786cf))

Fix

* Do not track empty assignment events ([39](https://github.com/amplitude/experiment-python-server/issues/39)) ([`e2fb39a`](https://github.com/amplitude/experiment-python-server/commit/e2fb39a2642d96278b43a4109ee3adb651f91e3a))

Fix

* Allow creation of multiple client instances based on api key ([38](https://github.com/amplitude/experiment-python-server/issues/38)) ([`b8defe4`](https://github.com/amplitude/experiment-python-server/commit/b8defe43126d48e25e025f1262b0fd01dde19b7f))

Fix

* Update FlagResult class and fix assignment tracking issue ([37](https://github.com/amplitude/experiment-python-server/issues/37)) ([`6a097cf`](https://github.com/amplitude/experiment-python-server/commit/6a097cfebdd3546d2041679c49ecff81c9482588))
* Provide AssignmentConfig class for use ([36](https://github.com/amplitude/experiment-python-server/issues/36)) ([`afbd36c`](https://github.com/amplitude/experiment-python-server/commit/afbd36c80048b9e8d9a4c8fd9dbb211d1fc4b9b1))
* Use relative import in LocalEvaluationConfig ([35](https://github.com/amplitude/experiment-python-server/issues/35)) ([`f5b7897`](https://github.com/amplitude/experiment-python-server/commit/f5b789703b3abb77387ac530526f1550a5a048ed))