fix(nano): authority handling on indexes with contracts

[glevco]

Motivation

This PR resolves https://github.com/HathorNetwork/nano-hathor-core/issues/251: the tokens API doesn't account for authorities stored in Nano Contracts, only in UTXOs.

ATTENTION: We also have to update the clients after this PR. The issue above lists the required changes. This can be done incrementally because the existing keys are kept in the response.

Acceptance Criteria

1. Rename NCSyscallRecord to NCIndexUpdateRecord to reflect the fact that now it can include updates caused by actions (not just syscalls).
2. Add new UpdateAuthoritiesRecord index update record and its respective handling.
3. Add counters for contracts holding token authorities in the tokens index.
4. Refactor usages of list[NCAction] to Sequence[NCAction] across syscalls and internal methods — since our usage is immutable we can use Sequence which is more flexible because it's covariant over its items, so we don't need to explicitly type the list when writing blueprints.
5. Add new rule preventing a revoke_authorities syscall when contracts don't hold the respective authority. Before, such revoke would simply be a no-op — this change is more consistent, prevents mistakes, and is easier to account for in the indexes.
6. Update /thin_wallet/tokens API so it also returns bools can_mint/can_melt which include contract authorities.
7. NOTE: even though the internal schema of the tokens index is changed, no migration is necessary because nano is disabled on mainnet and testnet, and there are no blueprints with authorities handling in bravo-nano-testnet.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	fix/nano/token-authorities
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.65 m (+0.48%) Baseline: 1.64 m	1.47 m (89.57%)	1.80 m (91.35%)

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[codecov]

Codecov Report

❌ Patch coverage is 78.48101% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.59%. Comparing base (1d13b1e) to head (2497168).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/runner/types.py	68.75%	9 Missing and 1 partial ⚠️
hathor/indexes/manager.py	71.42%	3 Missing and 5 partials ⚠️
hathor/indexes/rocksdb_tokens_index.py	83.33%	5 Missing and 2 partials ⚠️
hathor/nanocontracts/runner/runner.py	86.66%	3 Missing and 1 partial ⚠️
hathor/wallet/resources/thin_wallet/tokens.py	42.85%	2 Missing and 2 partials ⚠️
hathor/transaction/types.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1337      +/-   ##
==========================================
- Coverage   85.68%   85.59%   -0.09%     
==========================================
  Files         424      424              
  Lines       31989    32095     +106     
  Branches     4967     4994      +27     
==========================================
+ Hits        27411    27473      +62     
- Misses       3586     3616      +30     
- Partials      992     1006      +14     

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