feat: add parse mode

[quagmt]

Description

Introduced ParseMode, offering different behaviors for parsing string numbers into udecimal.Decimal:

• ParseModeError (default): returns an error if the total digits after the decimal point exceed the default precision.
• ParseModeTrunc: allows strings with any number of digits after the decimal point to be parsed into udecimal.Decimal. Excess digits will be truncated (not rounded).

Why is this feature required?

• When data from a database or an external API has more digits than the allowed precision, parsing it into udecimal.Decimal returns an error, preventing the use of udecimal.Decimal and its high performance capabilities in those cases.
• ParseModeTrunc resolves this issue by allowing some precision loss, if acceptable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.23%. Comparing base (751d5a2) to head (376075b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   96.19%   96.23%   +0.03%     
==========================================
  Files           5        5              
  Lines        1892     1910      +18     
==========================================
+ Hits         1820     1838      +18     
  Misses         48       48              
  Partials       24       24              

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