feat: Add resetAll() to MetricsContainer for testing.

[alexcsf]

Adds a resetAll() method to MetricsContainer which resets all of its Metrics to their respective initial values.

[codecov]

Codecov Report

Merging #176 (fea17fb) into master (332f4e7) will increase coverage by 0.74%.
The diff coverage is 88.23%.

@@             Coverage Diff              @@
##             master     #176      +/-   ##
============================================
+ Coverage     22.04%   22.78%   +0.74%     
- Complexity      112      122      +10     
============================================
  Files            32       32              
  Lines          1107     1119      +12     
  Branches        101      101              
============================================
+ Hits            244      255      +11     
- Misses          844      846       +2     
+ Partials         19       18       -1     

Impacted Files	Coverage Δ
...main/kotlin/org/jitsi/metrics/DoubleGaugeMetric.kt	22.22% <33.33%> (-2.78%)	⬇️
...src/main/kotlin/org/jitsi/metrics/BooleanMetric.kt	92.30% <100.00%> (+8.97%)	⬆️
...src/main/kotlin/org/jitsi/metrics/CounterMetric.kt	100.00% <100.00%> (ø)
...cs/src/main/kotlin/org/jitsi/metrics/InfoMetric.kt	100.00% <100.00%> (ø)
...c/main/kotlin/org/jitsi/metrics/LongGaugeMetric.kt	100.00% <100.00%> (ø)
.../main/kotlin/org/jitsi/metrics/MetricsContainer.kt	80.48% <100.00%> (+1.00%)	⬆️

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