Migrate processDate to java.time.LocalDateTime

[dmitri-carpov]

Motivation

Having access to the java.time API for the processingDate without additional date conversions.

Input

processingDate of java.util.Date type.

Output

• processingDate of java.time.LocalDateTime type.
• Examples code in the "Time Management" chapter updated - #3: Convert documentation to GitBook #16 (comment)

Test

val aStage = AnyStage withContext { context: ProcessContext =>
  context.processingDate // check if this is actually java.time.LocalDateTime
}

[suhailshergill]

@dmitri-carpov could we add more description similar to what's mentioned in https://github.com/ypg-data/eigenflow/blob/master/CONTRIBUTING.md ?