support refactored otlp export config (#1477)

upstream config now splits otlp exporters into otlp_http and otlp_grpc

* use const, remove insecure from otlp_http config

* Apply suggestions from code review

Co-authored-by: Tobias Bachert <git@b-privat.de>

* set default endpoints, fix review feedback

* move endpoint out of yaml anchor

* convert timeouts from millis to seconds

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Co-authored-by: Tobias Bachert <git@b-privat.de>

Author: brettmc

Common/Time/ClockInterface.php

@@ -9,6 +9,7 @@ interface ClockInterface
     public const NANOS_PER_SECOND = 1_000_000_000;
     public const NANOS_PER_MILLISECOND = 1_000_000;
     public const NANOS_PER_MICROSECOND = 1_000;
+    public const MILLIS_PER_SECOND = 1_000;
 
     /**
      * Returns the current epoch wall-clock timestamp in nanoseconds