Create/Update assets for version 1.17-pre4

assets/minecraft/sounds/ambient/underwater/_list.json

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+{"directories":["additions"],"files":["enter1.ogg","enter2.ogg","enter3.ogg","exit1.ogg","exit2.ogg","exit3.ogg","underwater_ambience.ogg"]}

assets/minecraft/sounds/ambient/underwater/additions/_list.json

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+{"directories":[],"files":["animal1.ogg","animal2.ogg","bass_whale1.ogg","bass_whale2.ogg","bubbles1.ogg","bubbles2.ogg","bubbles3.ogg","bubbles4.ogg","bubbles5.ogg","bubbles6.ogg","crackles1.ogg","crackles2.ogg","dark1.ogg","dark2.ogg","dark3.ogg","dark4.ogg","driplets1.ogg","driplets2.ogg","earth_crack.ogg","water1.ogg","water2.ogg"]}