crawling more information

[felixvonberlin]

This pull request allows the crawler to determine:

• the block height
• the minimum transaction fee required, and
• the ledger version
  of the crawled nodes.

It also allows the crawler to determine

• the common required transaction fee, and
• the common block height
  in the network, if possible.

[codecov-commenter]

Codecov Report

Merging #53 (81f7ee5) into main (7cd3159) will decrease coverage by 0.69%.
The diff coverage is 44.59%.

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@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
- Coverage   53.45%   52.76%   -0.69%     
==========================================
  Files           6        6              
  Lines         217      271      +54     
==========================================
+ Hits          116      143      +27     
- Misses        101      128      +27     

Files Changed	Coverage Δ
src/crawl/net.rs	22.44% <0.00%> (-9.91%)	⬇️
src/io/report.rs	67.16% <67.56%> (+0.49%)	⬆️
src/crawl/core_types.rs	87.09% <100.00%> (+0.43%)	⬆️
src/crawl/crawler.rs	77.27% <100.00%> (+0.52%)	⬆️

[cndolo]

Thank you for your contribution @felixvonberlin.
There are, however, a couple of things that need to be addressed before merging.

[felixvonberlin]

@cndolo I have followed most of your advice; but in some cases I would like to discuss them first.

[cndolo]

Thanks for your patience and addressing the comments @felixvonberlin . I still have a few minor issues and would be willing to merge once you have addressed those.

[felixvonberlin]

it's fixed ;-)