Have FlowConcurrentMap backed by MutableStateFlow

[twyatt]

Marked the private _onChanged property as nullable (Map<K, V>?) in combination with public onChanged property being exposed via filterNotNull in order to keep the previous behavior (no initial emission).

[codecov]

Codecov Report

Merging #5 into twyatt/binary-compatibility-validator will not change coverage.
The diff coverage is 85.71%.

@@                           Coverage Diff                            @@
##             twyatt/binary-compatibility-validator       #5   +/-   ##
========================================================================
  Coverage                                    82.60%   82.60%           
  Complexity                                      18       18           
========================================================================
  Files                                            1        1           
  Lines                                           23       23           
  Branches                                         4        4           
========================================================================
  Hits                                            19       19           
  Misses                                           4        4           

Impacted Files	Coverage Δ	Complexity Δ
collections/src/main/kotlin/FlowConcurrentMap.kt	82.60% <85.71%> (ø)	18.00 <1.00> (ø)

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