add progress logs for loading block/index

[smk762]

Ported from DigiByte-Core/digibyte#141

Close if considered pointless :)

[DeckerSU]

That's not a bad idea, but we already have a better implementation in KomodoOcean (Komodo-Qt). This implementation doesn't spam the standard output (in my personal opinion, a daemon shouldn't spam the standard output; it should use debug.log for any messages instead) and uses a log. The total progress looks like this:

2023-11-07 16:10:59 [10%]...[20%]...[30%]...[40%]...[50%]...[60%]...[70%]...[80%]...[90%]...[100%]...[DONE].
2023-11-07 16:11:24 LoadBlockIndexDB: loaded guts
2023-11-07 16:11:39 LoadBlockIndexDB: last block file = 218
2023-11-07 16:11:39 LoadBlockIndexDB: last block file info: CBlockFileInfo(blocks=23907, size=127470485, heights=3641721...3665165, time=2023-10-21...2023-11-06)
2023-11-07 16:11:39 Checking all blk files are present...
2023-11-07 16:11:39 [10%]...[20%]...[30%]...[40%]...[50%]...[60%]...[70%]...[80%]...[90%]...[100%]...[DONE].

Therefore, I prefer to close this pull request for now and use the KomodoOcean's progress bar implementation in the main Komodo repository. I will open a new pull request for this later.

[DeckerSU]

#592 (comment)