[REG-1154] - Add ENS DNSSEC smart contracts to configs, artifacts and sandbox

[DeRain]

PR Checklist

1. Contracts versioning

• Make sure that the patch version of the contracts is increased if changes have been made to the UNSRegistry, MintingManager, ProxyReader, ENSCustody contracts.
• Make sure that the minor version of the contracts is increased if breaking changes have been made to the UNSRegistry, MintingManager, ProxyReader, ENSCustody contracts. It includes changes of interfaces.

2. Contracts licensing

• Make sure that no SPDX-License-Identifier defined in contracts.
• Make sure that the header is added to the new contract files.

  // @author Unstoppable Domains, Inc.
  // @date {Month} {Day}(ordinal), {Year}
  

3. Coverage

• Make sure that the coverage of contracts has not decreased and strive 100%

4. Configs versioning

• Make sure that the version of uns-config.json is increased if changes have been made to the config.
• Make sure that the version of ens-config.json is increased if changes have been made to the config.
• Make sure that the version of resolver-keys.json is increased if changes have been made to the config.
• Make sure that the version of ens-resolver-keys.json is increased if changes have been made to the config.

5. Package versioning

• Make sure that the patch version of package is increased if valuable changes have been made to the package. It includes contracts update, configs update, etc.
• Make sure that the major.minor version of package is synced with version of UNSRegistry contract.
• Make sure that the CHANGELOG is updated with short description for the new version.

6. Code review

• resolver-keys.json code review is required from DevTools team
• ens-resolver-keys.json code review is required from DevTools team
• For all other changes code review is required from Registry team

[github-advanced-security]

Slither found more than 10 potential problems in the proposed changes. Check the Files changed tab for more details.

[github-actions]

Contracts size report

Contract name	Size (KiB)	Delta (KiB)
ENSCustody	13.055	0
MintingManager	17.214	0
ProxyReader	15.176	0
UNSRegistry	19.943	0

[codecov-commenter]

Codecov Report

Merging #310 (4594c05) into main (1f62012) will increase coverage by 11.77%.
The diff coverage is n/a.

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@@             Coverage Diff             @@
##             main     #310       +/-   ##
===========================================
+ Coverage   86.92%   98.70%   +11.77%     
===========================================
  Files          34       20       -14     
  Lines        1239     1000      -239     
  Branches      181      217       +36     
===========================================
- Hits         1077      987       -90     
+ Misses        162       13      -149     

see 14 files with indirect coverage changes

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[nickshatilo]

Shall we include links to initial sources for all of this contracts?

[nickshatilo]

I think it makes sense to add a test minting a DNS-proved ENS domain to ensure valid configuration. Probably in sandbox/index.test.ts

[nickshatilo]

LGTM apart from some minor stuff