Use spray json like approach for config derivation with Pureconfig

[chetanmeh]

This PR is based on work done as part of #4509 to figure out approaches to reduce compilation times. It uses a new proposed approach to switch to non Shapeless based config derivation similar to what we do with spary-json

Description

This PR is a work in progress till the new support in Pureconfig is completed. With new approach the compilation time for common/scala module reduced from ~ 60 sec to ~40 sec on my laptop

Related issue and scope

• I opened an issue to propose and discuss this change (Analyze OpenWhisk Scala compilation for performance #4509)

My changes affect the following components

• API
• Controller
• Message Bus (e.g., Kafka)
• Loadbalancer
• Invoker
• Intrinsic actions (e.g., sequences, conductors)
• Data stores (e.g., CouchDB)
• Tests
• Deployment
• CLI
• General tooling
• Documentation

Types of changes

• Bug fix (generally a non-breaking change which closes an issue).
• Enhancement or new feature (adds new functionality).
• Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• I signed an Apache CLA.
• I reviewed the style guides and followed the recommendations (Travis CI will check :).
• I added tests to cover my changes.
• My changes require further changes to the documentation.
• I updated the documentation where necessary.

[chetanmeh]

Below are the scalac profiling stats via -Ystatistics flag

Key aspects

1. Time delta - Time reduced from 1 mins 12.067 secs to 47.163 secs
2. Max time reduction was in typer phase from ~ 34s to ~15s

Current master

*** Cumulative timers for phases
#total compile time           : 1 spans, ()68896.897ms
  parser                      : 1 spans, ()858.851ms (1.2%)
  namer                       : 1 spans, ()273.763ms (0.4%)
  packageobjects              : 1 spans, ()3.263ms (0.0%)
  typer                       : 1 spans, ()34395.613ms (49.9%)
  patmat                      : 1 spans, ()4908.32ms (7.1%)
  superaccessors              : 1 spans, ()404.523ms (0.6%)
  extmethods                  : 1 spans, ()171.529ms (0.2%)
  pickler                     : 1 spans, ()225.027ms (0.3%)
  xsbt-api                    : 1 spans, ()3382.517ms (4.9%)
  xsbt-dependency             : 1 spans, ()1417.352ms (2.1%)
  refchecks                   : 1 spans, ()2281.169ms (3.3%)
  uncurry                     : 1 spans, ()2171.694ms (3.2%)
  fields                      : 1 spans, ()1780.857ms (2.6%)
  tailcalls                   : 1 spans, ()422.632ms (0.6%)
  specialize                  : 1 spans, ()1144.106ms (1.7%)
  explicitouter               : 1 spans, ()369.297ms (0.5%)
  erasure                     : 1 spans, ()4057.839ms (5.9%)
  posterasure                 : 1 spans, ()209.068ms (0.3%)
  lambdalift                  : 1 spans, ()432.697ms (0.6%)
  constructors                : 1 spans, ()318.683ms (0.5%)
  flatten                     : 1 spans, ()183.302ms (0.3%)
  mixin                       : 1 spans, ()1522.448ms (2.2%)
  cleanup                     : 1 spans, ()237.473ms (0.3%)
  delambdafy                  : 1 spans, ()621.277ms (0.9%)
  jvm                         : 1 spans, ()7024.781ms (10.2%)
  xsbt-analyzer               : 1 spans, ()22.947ms (0.0%)
Completed Scala compilation: 1 mins 12.067 secs

Post config switch

*** Cumulative timers for phases
#total compile time           : 1 spans, ()40351.618ms
  parser                      : 1 spans, ()2254.276ms (5.6%)
  namer                       : 1 spans, ()364.664ms (0.9%)
  packageobjects              : 1 spans, ()156.344ms (0.4%)
  typer                       : 1 spans, ()15632.499ms (38.7%)
  patmat                      : 1 spans, ()2686.365ms (6.7%)
  superaccessors              : 1 spans, ()292.228ms (0.7%)
  extmethods                  : 1 spans, ()115.676ms (0.3%)
  pickler                     : 1 spans, ()198.844ms (0.5%)
  xsbt-api                    : 1 spans, ()2639.931ms (6.5%)
  xsbt-dependency             : 1 spans, ()833.732ms (2.1%)
  refchecks                   : 1 spans, ()850.849ms (2.1%)
  uncurry                     : 1 spans, ()938.083ms (2.3%)
  fields                      : 1 spans, ()492.616ms (1.2%)
  tailcalls                   : 1 spans, ()257.213ms (0.6%)
  specialize                  : 1 spans, ()845.471ms (2.1%)
  explicitouter               : 1 spans, ()233.063ms (0.6%)
  erasure                     : 1 spans, ()2262.172ms (5.6%)
  posterasure                 : 1 spans, ()177.216ms (0.4%)
  lambdalift                  : 1 spans, ()397.438ms (1.0%)
  constructors                : 1 spans, ()247.595ms (0.6%)
  flatten                     : 1 spans, ()134.042ms (0.3%)
  mixin                       : 1 spans, ()1405.549ms (3.5%)
  cleanup                     : 1 spans, ()140.578ms (0.3%)
  delambdafy                  : 1 spans, ()403.887ms (1.0%)
  jvm                         : 1 spans, ()6313.895ms (15.6%)
  xsbt-analyzer               : 1 spans, ()20.235ms (0.1%)
Completed Scala compilation: 47.163 secs

[rabbah]

This looks worthwhile.

[chetanmeh]

This needs to be put on hold for some time as no consensus was reached on Pureconfig side on used approach. Need to try a new simple macro based approach which looks like would take some time

[style95]

@chetanmeh
I marked this PR as stale to close soon due to long inactivity.
But this is already approved and looks worthwhile.
Please let me know if you would work on it again.