Replace snafu with this_error and remove global error enum

[imabdulbasit]

This PR:

• Removes global error enum by moving the variants to a BlockBuildingError enum
• removes snafu dependency from everywhere except from the availability endpoint, as hotshot query service still uses it
• moves error types into their relevant modules
• use parse_duration and parse_size from espresso_types::utils

This PR does not remove snafu dependency completely, as we need to replace snafu with this_error in hotshot query service

[tbro]

Looks good. I left a couple of comments.

[tbro]

I don't really see the point of Custom. If we know we have a potential error, why would we not add it to the enum?

On the other hand, I think this can only ever potentially fail on 32 bit architecture, so the failure case would be something like "too large max block size for architecture". But if that is the case, then user would never be able to build payloads, so maybe instead of returning that error we should panic w/ it...?

[imabdulbasit]

Yeah, I agree. I'll remove custom and panic here

[tbro]

I think this addresses #1539, and Closes #1681 and #1699. Is that right?

[imabdulbasit]

I think this addresses #1539, and Closes #1681 and #1699. Is that right?

Yes

[tbro]

So it doesn't completely remove the snafu , as the query service is using it and we are extending the availability endpoint. However, I have replaced it with this_error everywhere else

Ok so #1539 will remain open for now