Stdout exporter for span and metrics

[zeitlinger]

Follow up to #6675

[codecov]

Codecov Report

Attention: Patch coverage is 93.40102% with 13 lines in your changes missing coverage. Please review.

Project coverage is 90.11%. Comparing base (7f8fbc9) to head (dbc35fa).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
...lemetry/exporter/internal/ExporterBuilderUtil.java	79.06%	6 Missing and 3 partials ⚠️
...tlp/internal/metrics/OtlpStdoutMetricExporter.java	93.54%	1 Missing and 1 partial ⚠️
...g/otlp/internal/traces/OtlpStdoutSpanExporter.java	92.59%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #6750 +/- ## ============================================ + Coverage 90.03% 90.11% +0.07%  - Complexity 6475 6521 +46  ============================================ Files 718 726 +8 Lines 19573 19669 +96 Branches 1931 1935 +4 ============================================ + Hits 17622 17724 +102  + Misses 1353 1346 -7  - Partials 598 599 +1 

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[zeitlinger]

@jack-berg here's the PR that brings metrics and spans to the same level as logs were before

memory mode will be the final PR