add support for token accounts assets

[cfaur09]

Reasoning

• For tokens/:token/accounts, for each account, the assets field is missing

Proposed Changes

• Adding the assets field for each account that owns a specific token

How to test

• /tokens/WEGLD-bd4d79/accounts -> every account should contain assets field
• tokens/BHAT-c1fde3/accounts -> if an account does not have assets defined, the assets field will not be displayed

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (c427d6c) 64.58% compared to head (4f35911) 64.58%.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #1114      +/-   ##
===============================================
- Coverage        64.58%   64.58%   -0.01%     
===============================================
  Files              577      577              
  Lines            15022    15026       +4     
  Branches          1550     1550              
===============================================
+ Hits              9702     9704       +2     
- Misses            3962     3965       +3     
+ Partials          1358     1357       -1     

Flag	Coverage Δ
integrationtests	64.44% <100.00%> (-0.01%)	⬇️
unittests	33.96% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/endpoints/tokens/entities/token.account.ts	100.00% <100.00%> (ø)
src/endpoints/tokens/token.service.ts	45.78% <100.00%> (+0.14%)	⬆️

... and 6 files with indirect coverage changes

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