bitmovin Analytics: Bugfix and added two missing attributes

[aachenmax]

I added two missing enums for AnalyticsAttribute: REBUFFER_PERCENTAGE and VIDEOSTART_FAILED.

I fixed a bug/problem for the /analytics/impression API endpoint. The response for this endpoint comes as a python list, which is attempted to be converted into a dictionary, throwing an Exception. Maybe there is a more elegant solution though. Here is some minimal code to reproduce this error without the fix:

from bitmovin_api_sdk import bitmovin_api, AnalyticsLicenseKey

api_key = 'XXX'
tenant_org_id = 'XXX'
license_key = 'XXX'
test_impression = '8b789d1c-a47b-4401-85ef-18ab68113825'
bitmovinApi = bitmovin_api.BitmovinApi(api_key=api_key, tenant_org_id=tenant_org_id)
response = bitmovinApi.analytics.impressions.create(impression_id=test_impression, analytics_license_key=AnalyticsLicenseKey(license_key=licenses_key))
print(response)

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✅ aachenmax
❌ hofmannben
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