Use BigInt for OpId internally #209
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rkistner
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For our JSON protocol, we use strings to represent OpIds, since JS cannot reliably parse large numbers in JSON.
However, for internal usage, there was a mixture of string and bigint for that, leading in conversions between the two everywhere. This switches over to bigint in most places, only converting to return a response to the client. This results in less conversion between the two.
There are a small number of places where we use the large protocol types internally, and these do still use the string version.
This also fixes a couple of places where not-null or casts were incorrectly used, resulting in unexpected type mismatches at runtime. This specifically fixes an issue of MySQL BigLogStream tests not being setup correctly, as well as a race condition when stopping MySQL replication immediately after starting it.