Implement Account API

[jiak94]

• feat: ✨ implement get user profile interface
• feat: ✨ implement get balance interface
• feat: ✨ implement get history interface
• feat: ✨ implement get gainloss interface
• docs: 📝 update readme

[codecov]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (c891d61) 93.91% compared to head (6587256) 94.99%.

Files	Patch %	Lines
asynctradier/tradier.py	87.50%	11 Missing ⚠️
asynctradier/common/account_balance.py	87.93%	7 Missing ⚠️
asynctradier/common/event.py	88.23%	2 Missing ⚠️
asynctradier/common/gain_loss.py	86.66%	2 Missing ⚠️
asynctradier/common/user_profile.py	93.33%	1 Missing ⚠️
tests/test_tradier.py	99.64%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   93.91%   94.99%   +1.08%     
==========================================
  Files          15       19       +4     
  Lines        1019     1719     +700     
==========================================
+ Hits          957     1633     +676     
- Misses         62       86      +24     

Flag	Coverage Δ
unittests	94.99% <96.58%> (+1.08%)	⬆️

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