[#2130] adm: Add dump-nns and restore-nns commands

[KirillovDenis]

close #2130

[codecov]

Codecov Report

Attention: Patch coverage is 3.50195% with 248 lines in your changes missing coverage. Please review.

Project coverage is 30.53%. Comparing base (42554a9) to head (b28c586).
Report is 1410 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/neofs-adm/internal/modules/morph/nns.go	0.00%	241 Missing ⚠️
cmd/neofs-adm/internal/modules/morph/root.go	56.25%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2138      +/-   ##
==========================================
- Coverage   30.78%   30.53%   -0.25%     
==========================================
  Files         382      383       +1     
  Lines       28056    28313     +257     
==========================================
+ Hits         8637     8646       +9     
- Misses      18687    18935     +248     
  Partials      732      732              

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[KirillovDenis]

Currently, this PR sub-optimal in terms of tx sending (we await txs for every domains, this should be fixed a little bit later).

Also there are the following problems/questions:

• NNS contract doesn't have methods to get owner and admin for specific domain. Should we try to get this info using raw contract storage (it seems that some owners should be changed after redeployment (e.g. for container domain))?
• If domain already has some records should we 1) add missed records, 2) overwrite all records 3) skip restoring this domain ?

/cc @alexvanin @fyrchik

[carpawell]

@roman-khimov, @cthulhu-rider, I have checked this PR, TBH, I would redo some things and also it is from an archive repo now. Do not understand the 1st question, we have (and seems like always had OwnerOf method). The second one is a regular question, we just need a consensus here (I think "add missed records" is the way).

Suggest closing this PR, or merging it and continuing immediately with extensions via another PRs. An opened draft for two+ years makes me nervous.

[roman-khimov]

1. This won't merge without update
2. Some things need to be fixed, but they will take some time
3. I don't believe in dump/restore concept, it's very suspicious to me and I'm not sure we can easily survive this.
4. I've never seen this being done in practice and never needed it.
5. We'll have Using NeoFS to store blocks and snapshots neo-project/neo#3463 eventually, so chain migration doesn't seem to be valuable at all.
6. If needed, the code won't go away and we can return to it.

[roman-khimov]

I think it's broken here. Domains have owners and we're not keeping them.