refactor(sdk): Use `Mapping` instead of `CachingMap` #9612

Job	Run time
build	41s
node-docker-image / build	5m 31s
lint	1m 18s
autocertifier-server / test	55s
cdn-location / test	32s
cli-tools / test	4m 19s
dht / test	3m 20s
dht-browser / test	5m 15s
geoip-location / test	52s
node / test	1m 37s
node-e2e / test	5m 18s
proto-rpc / test	59s
sdk / test	2m 20s
sdk-browser / test	1m 48s
sdk-e2e / test	4m 51s
sdk-browser-e2e / test	4m 50s
test-utils / test	41s
trackerless-network / test	2m 33s
utils / test	53s
trackerless-network-browser / test	2m 38s
	51m 11s

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