Rewrite performance statistics collection

This commit introduces notion of 'PerformanceManager' in CLI, suitable
for collecting performance metrics of the compiler. It:

- provides `notifyX{Started/Finished}` API, where 'X' is some
measurable event (previously there were just ad hoc manual time
measurements using System.nanoTime() and stuff)

- collects measurements, so that later they can be reported in an
appropriate way (previously measurements were reported immediately to
MessageCollector as plain strings)

- allows overriding to collect metrics, specific for just one target
platform compilation

Also, common logic of compiler performance statistics collection was
extracted from platform-compilers (K2JVMCompiler) to common classes
(CLICompiler), to allow other platform-compilers (e.g. K2JSCompiler)
re-use it.

compiler/testData/cli/js/jsExtraHelp.out

@@ -18,6 +18,7 @@ where advanced options include:
   -Xproper-ieee754-comparisons Generate proper IEEE 754 comparisons in all cases if values are statically known to be of primitive numeric types
   -Xread-deserialized-contracts Enable reading of contracts from metadata
   -Xreport-output-files      Report source to output files mapping
+  -Xreport-perf              Report detailed performance statistics
   -Xskip-metadata-version-check Load classes with bad metadata version anyway (incl. pre-release classes)
   -Xuse-experimental=<fq.name> Enable usages of COMPILATION-affecting experimental API for marker annotation with the given fully qualified name