ref #65, add support for 10 formula functions

[fsfsx]

PR Details

Add support for 10 formula functions: ARRAYTOTEXT, FORECAST, FORECAST.LINEAR, FREQUENCY, INTERCEPT, ODDFYIELD, ODDLPRICE, ODDLYIELD, PROB and VALUETOTEXT

Motivation and Context

China Computer Federation (CCF) 2023 Code Camp

How Has This Been Tested

I have added unit test cases for this and all unit test passed.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #1630 (3005203) into master (15614ba) will increase coverage by 0.01%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #1630      +/-   ##
==========================================
+ Coverage   98.89%   98.91%   +0.01%     
==========================================
  Files          31       31              
  Lines       26140    26482     +342     
==========================================
+ Hits        25852    26194     +342     
  Misses        191      191              
  Partials       97       97              

Flag	Coverage Δ
unittests	98.91% <100.00%> (+0.01%)	⬆️

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

Files Changed	Coverage Δ
calc.go	99.15% <100.00%> (+0.02%)	⬆️

[xuri]

LGTM, thanks for your contribution.