Various improvements to Retry strategies

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* ZIO POC #1

* Add Fiber Ancestry trace

* noticket comment mutable Spec

* Decorate Exit.Cause with traces on Fail in RTS

* Exclude Exit.Cause.trace field from equals/hashCode (???)

* wrap ZIO.const

* Fail now takes a stack trace gen

* Add Refail and decorate foreachPar/racePar APIs with it

* fixup trace for `blocking.blocking`, reduce uses for ZIO.identityFn for better traces, add a traceEffects switch

* Obey Platform-level TracingConfig. unblock scala.js version.

* re-enable inlining by fixing typo in scalac options

* enable inlining for `internal` package only (interferes with traces)

* Add inheritable tracing regions. Craft .bracket* traces, optimize global cache

* cache reflection failuires; .intern() strings after substitutions; refail in raceBoth & raceAttempt; Add AsmTracer vs. AkkaTracer benchmar; Add IODeepLeftBindBenchmark

* refactor ZTrace printing; always show FiberId; do not trace EffectTotal/With continuation if effect failed

* Always mention Execution trace / stack trace in ZTrace pretty print, even if empty.

* Use must_=== instead of throwA to ignore traces in test equality

* Move stacktraces spec to 2.12+ only

* Add Akka licence notice, move global cache under Tracer object

* fix imports

* ringbuffer fixed

* cleanups

* scalafmt

* Extend StacktracesSpec; put future trace on top in pretty print; remove FiberAncestry class;

* Fix stack traces for FlatMap's Effect* happy path; extend suite with regressions

* Add lambda wrapping for folM, catchAll and catchSome

* remove duplicate interrupt tests in RTSSpec

* Repalce Refail and trace fields with Cause.Traced!

* merge fixes

* traceExec/Stack as vals in FiberContext

* Pack tracing fields in Platform into Tracing case class

* fmt

* add newlines between ring buffer fields

* remove comment in AsmTracer

* fix TwitterSpec

* add lambda wrapping for fold/tapError/mapError/bimap/tapBothorElse/zipWith

* fmt

* restrict StacktracesSpec to 2.12-2.13 only (no dotty)

* increase timeouts in ZManagedSpec as a workaround (should use latches)

* fmt

* reposition sleep in TwitterSpec

* unused import

* tweak TwitterSpec

* Symmetric equals for Cause.Traced

* AkkaTracer -> AkkaLineNumbersTracer

* remove null in Js.PlatformLive

* remove dead code & add apache licence headers

* post-merge fixup

* Add CheckTracing

* optimize recordTrace

* add final

* add pushContinuation

* Migrate all tests to ZIO Test #1647 - ExecutorSpec

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #2

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #3

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #4

* #1647-ExecutorSpec

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #5

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #6

* Migrate all tests to ZIO Test #1647 - ExecutorSpec, patch #7

Tests for dumpStr

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