add sdk-config 0.3 support for key/value headers and attributes

[brettmc]

• headers and attributes are now arrays with key and value elements
• headers can optionally contain a headers_list element which supports a lower-priority CSV of key/value entries
• attributes can optionally contain an attributes_list element which supports a lower-priority CSV of key/value entries

Related: #1423

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 40 lines in your changes missing coverage. Please review.

Project coverage is 73.26%. Comparing base (8857b0c) to head (35216e7).

Files with missing lines	Patch %	Lines
.../Config/SDK/ComponentProvider/OpenTelemetrySdk.php	0.00%	13 Missing :warning:
...K/ComponentProvider/Logs/LogRecordExporterOtlp.php	0.00%	9 Missing :warning:
...K/ComponentProvider/Metrics/MetricExporterOtlp.php	0.00%	9 Missing :warning:
...g/SDK/ComponentProvider/Trace/SpanExporterOtlp.php	0.00%	9 Missing :warning:

Additional details and impacted files

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[brettmc]

@open-telemetry/php-approvers I think this is ready for review now.