Consider removing dependency on pureconfig for shared modules

[migesok]

pureconfig at the current stage doesn't guarantee binary compatibility and is known to break it.
For instance if you try to use pureconfig 0.14.1 together with the current kafka-journal persistence plugin which is built against 0.12.3 you get this error in runtime:

java.lang.NoClassDefFoundError: pureconfig/generic/MapShapedReader$WithDefaults
at com.evolutiongaming.kafka.journal.JournalConfig$HeadCache$anon$lazy$macro$15$1.inst$macro$1$lzycompute(JournalConfig.scala:30)
at com.evolutiongaming.kafka.journal.JournalConfig$HeadCache$anon$lazy$macro$15$1.inst$macro$1(JournalConfig.scala:30)
at com.evolutiongaming.kafka.journal.JournalConfig$HeadCache$.<clinit>(JournalConfig.scala:30)
at com.evolutiongaming.kafka.journal.JournalConfig$.apply$default$3(JournalConfig.scala:12)
at com.evolutiongaming.kafka.journal.JournalConfig$.<clinit>(JournalConfig.scala:16)
at akka.persistence.kafka.journal.KafkaJournalConfig$.apply$default$1(KafkaJournalConfig.scala:12)
at akka.persistence.kafka.journal.KafkaJournalConfig$.<clinit>(KafkaJournalConfig.scala:22)
at akka.persistence.kafka.journal.KafkaJournal.kafkaJournalConfig(KafkaJournal.scala:63)
at akka.persistence.kafka.journal.KafkaJournal.$anonfun$adapterIO$1(KafkaJournal.scala:134)

This makes it hard to combine kafka-journal persistence plugin with other code which uses pureconfig.

At the same time the dependency on it looks easily replaceable with handwritten config reader methods.

[arixmkii]

Will not be that simple. It is a transitive one from https://github.com/evolution-gaming/scassandra as well... 😞

[arixmkii]

Shaded versions for both projects (ce2 flavors):

• scassandra https://github.com/arixmkii/scassandra/tree/shaded-pureconfig
• kafka-journal https://github.com/arixmkii/kafka-journal/tree/shaded-pureconfig