JavaScript: provide a standard way of creating longs from a number

[fasterthanlime]

Like I pointed out in #4232 (comment) - using createLong from javascript is currently error-prone.

I suggest adding another way to create a long from a javascript number, shipping one of the algorithms linked in the SO thread in my original comment, so that there's less risk of user error.

As to not break backwards compatibility, the original createLong should probably remain there.

[aardappel]

Agreed to having that as built-in functionality.

[shaunc]

Also -- how to do the reverse? I have a 128 bit hash code stored as two ulongs in a Flatbuffer, and want to compare (computed via fnv-1a/128). Best would be able to get and set via Uint32Arrays. Conversion to floats is disingenuous, IMHO -- obviously not suited to hash values.

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[shaunc]

@aardappel -- any chance of seeing this move forward?

[aardappel]

@shaunc someone would have to create a PR.. I personally know very little about JS.

Does this issue also affect TS? @krojew

[krojew]

Yes, since they share the same code.

[github-actions]

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