Discover indexes sequentially

[moreal]

This pull request tries to resolve #2338.

Overview

Since #1606, the blockchain node has been forking chain while syncing blocks. So there are too many forked chain ids. And they occur very deep recursion depth (stack overflow).

So this pull request makes RocksDBStore.IterateIndexes discover indexes sequentially without recursion. Fetch chain ids and store it as stack, iterate them.

• Add more test cases.

[longfin]

I left minor comments 🙏

[longfin]

Is this casting (i.e., (int)) safe? I guess (long) seems natural... (of course, it is unnatural that offset was int, but... 🤔 )

[moreal]

Yes, I agree about it. In my thought, it was int because LINQ Enumerable.Skip supports only int type as argument 😭 So... it may be better to skip manually (with continue in for-loop)

[moreal]

I made it handle block indexes as long type instead of int type in cdc8b2a. Please review again 🙇🏻‍♂️

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Total files changed: 3

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.cs : +86 -15

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