Provide simple option for limiting total memory usage

Issues
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3

gonzojive commented :

I am attempting to restore from backup and running out of memory. Here’s a memory profile:

memprofile25s
memprofile25s1243×2269 163 KB

latest options:

func badgerOpts(dbPath string) badger.Options {
	return badger.DefaultOptions(dbPath).
		WithValueLogLoadingMode(options.FileIO).
		WithTableLoadingMode(options.FileIO).
		WithNumMemtables(1).
		WithCompression(options.Snappy).
		WithKeepL0InMemory(false).WithLogger(&gLogger{})
}