[IMP] l10n_br_account: migration script

[felipemotter]

@rvalyi pelos meus testes agora o script de migração ta correto. Se alguém puder testar também....

[github-grap-bot]

Hi @rvalyi, @renatonlima,
some modules you are maintaining are being modified, check this out!

[codecov]

Codecov Report

Merging #213 (b8df7dd) into 14.0-kill-dummy-14 (9915e04) will decrease coverage by 0.04%.
The diff coverage is 77.04%.

@@                  Coverage Diff                   @@
##           14.0-kill-dummy-14     #213      +/-   ##
======================================================
- Coverage               87.00%   86.96%   -0.04%     
======================================================
  Files                     571      594      +23     
  Lines                   21296    21716     +420     
  Branches                 2641     2703      +62     
======================================================
+ Hits                    18528    18885     +357     
- Misses                   1952     2008      +56     
- Partials                  816      823       +7     

Impacted Files	Coverage Δ
l10n_br_account/__init__.py	100.00% <ø> (ø)
l10n_br_account/tests/__init__.py	100.00% <ø> (ø)
l10n_br_account_nfe/models/account_move_line.py	76.92% <ø> (ø)
..._account_payment_order/models/account_move_line.py	93.81% <ø> (ø)
l10n_br_base/__init__.py	38.88% <0.00%> (-2.29%)	⬇️
l10n_br_fiscal/models/document.py	76.92% <0.00%> (+0.07%)	⬆️
l10n_br_fiscal/models/document_eletronic.py	69.62% <ø> (ø)
l10n_br_fiscal/models/res_config_settings.py	100.00% <ø> (ø)
l10n_br_fiscal/tests/__init__.py	100.00% <ø> (ø)
l10n_br_nfse_paulistana/models/document.py	54.74% <0.00%> (+0.39%)	⬆️
... and 76 more

... and 8 files with indirect coverage changes

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