RDB Shredder: align PostgresConstraints with atomic.events 0.10.0

[knservis]

This should be happening automatically. I believe we should have a new issue where we generate this somehow from the atomic events schema, which can be found here:
https://github.com/snowplow/snowplow/blob/master/4-storage/redshift-storage/sql/atomic-def.sql

This has caused temporary (recoverable) loss of data after the atomic.events field lengths were changed.

snowplow-rdb-loader/shredder/src/main/scala/com.snowplowanalytics.snowplow.storage/spark/utils/PostgresConstraints.scala

Line 18 in 2343b1d

object PostgresConstraints {

[chuwy]

Hey @alexanderdean, from my POV this is blocking whole PII enrichment feature. Should it be a part of R29?

[chuwy]

Prioritized to R29.

[chuwy]

Total 10 constraints were widened, which means Shredder probably silently truncated several other fields (less important though).