Allows API packages to specify file-based and env-based config (#1621)

* Move `ComponentProvider` and related classes to API

* Use API `ComponentProvider`

* Use API `ComponentProvider` in tests

* Add `EnvComponentLoader` API

* Add `EnvComponentLoader` example

* Ignore deptrac violations

* Remove namespace from `ComponentProvider` BC layer

* Add API requirement to config package

* Fix/suppress unrelated phpstan errors caused by `google/protobuf` `^4.31`

Author: Nevay

MetricConverter.php

@@ -204,9 +204,7 @@ private function convertHistogramDataPoint(SDK\Metrics\Data\HistogramDataPoint $
         $pHistogramDataPoint->setTimeUnixNano($dataPoint->timestamp);
         $pHistogramDataPoint->setCount($dataPoint->count);
         $pHistogramDataPoint->setSum($dataPoint->sum);
-        /** @phpstan-ignore-next-line */
         $pHistogramDataPoint->setBucketCounts($dataPoint->bucketCounts);
-        /** @phpstan-ignore-next-line */
         $pHistogramDataPoint->setExplicitBounds($dataPoint->explicitBounds);
         foreach ($dataPoint->exemplars as $exemplar) {
             /** @psalm-suppress InvalidArgument */

ProtobufSerializer.php

@@ -103,7 +103,7 @@ private static function serializeToJsonString(Message $message): string
         // @phan-suppress-next-line PhanUndeclaredClassReference
         if (\class_exists(\Google\Protobuf\PrintOptions::class)) {
             try {
-                /** @psalm-suppress TooManyArguments @phan-suppress-next-line PhanParamTooManyInternal,PhanUndeclaredClassConstant @phpstan-ignore arguments.count */
+                /** @psalm-suppress TooManyArguments @phan-suppress-next-line PhanParamTooManyInternal,PhanUndeclaredClassConstant */
                 return $message->serializeToJsonString(\Google\Protobuf\PrintOptions::ALWAYS_PRINT_ENUMS_AS_INTS);
             } catch (\TypeError) {
                 // google/protobuf ^4.31 w/ ext-protobuf <4.31 installed