refactor(layers/prometheus-client): provide builder APIs similar to `PrometheusLayer` #1432

Job	Run time
memory / memory / fuzz_reader	6m 17s
fs / local_fs / fuzz_reader	6m 20s
s3 / 0_minio_s3 / fuzz_reader	6m 27s
azblob / azurite_azblob / fuzz_reader	6m 4s
memory / memory / fuzz_writer	6m 43s
fs / local_fs / fuzz_writer	7m 3s
s3 / 0_minio_s3 / fuzz_writer	6m 25s
azblob / azurite_azblob / fuzz_writer	6m 4s
	51m 23s

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