refactor(core): Remove unused layer `MadsimLayer` #1059

Job	Run time
memory / memory / fuzz_reader	6m 31s
fs / local_fs / fuzz_reader	5m 49s
s3 / 0_minio_s3 / fuzz_reader	7m 38s
azblob / azurite_azblob / fuzz_reader	7m 57s
memory / memory / fuzz_writer	7m 57s
fs / local_fs / fuzz_writer	7m 35s
s3 / 0_minio_s3 / fuzz_writer	7m 13s
azblob / azurite_azblob / fuzz_writer	7m 49s
	58m 29s

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