Add missing AccountRoot fields

[nkramer44]

Fixes #398 .

I also noticed that AccountSet.mintAccount had an old JSON field value, so I updated that. Also added an IT in NfTokenIT that mints an NFT via an authorized minter.

[codecov]

Codecov Report

Merging #399 (e5384d1) into main (95e7e65) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #399   +/-   ##
=========================================
  Coverage     90.04%   90.04%           
  Complexity     1374     1374           
=========================================
  Files           265      265           
  Lines          3996     3996           
  Branches        332      332           
=========================================
  Hits           3598     3598           
  Misses          278      278           
  Partials        120      120           

Impacted Files	Coverage Δ
...rg/xrpl/xrpl4j/model/ledger/AccountRootObject.java	100.00% <ø> (ø)
...org/xrpl/xrpl4j/model/transactions/AccountSet.java	94.87% <ø> (ø)

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