Adding additional APIs and pointing header directly into file#2

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traetox wants to merge 7 commits intocloudflare:masterfrom

Commits on Mar 26, 2021

adding sync and close methods
kris-watts-gravwell
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Commits on Apr 1, 2021

Adding in ability to open existing without truncating
kris-watts-gravwell
committed

Commits on Apr 9, 2021

OK, it totally works now
kris-watts-gravwell
committed