common-streams 0.8.x with refactored kinesis source

[istreeter]

The following improvements are introduced via common-streams 0.8.0-M4:

• Fields starting with a digit are now prefixed with an underscore _. This is needed for Hudi, which does not allow fields starting with a digit (https://github.com/snowplow/schema-ddl/pull/209)
• New kinesis source implementation without fs2-kinesis (https://github.com/snowplow-incubator/common-streams/pull/84)
• Iglu schemas are resolved in parallel, for short pause times during event processing (https://github.com/snowplow-incubator/common-streams/pull/85)
• Common http client configured with restricted max connections per server (https://github.com/snowplow-incubator/common-streams/pull/87)
• Iglu scala client 3.2.0 no longer relies on the "list" schemas endpoint (https://github.com/snowplow/iglu-scala-client/pull/255)