add read last update data

[peterdudfield]

Pull Request

Description

add a read function to read 'InputDataLastUpdatedSQL' Fixes #20

How Has This Been Tested?

• normal tests

• added tests

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #22 (e181379) into main (c49c9b9) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   97.34%   97.37%   +0.02%     
==========================================
  Files          16       16              
  Lines         528      534       +6     
==========================================
+ Hits          514      520       +6     
  Misses         14       14              

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	98.88% <100.00%> (+0.07%)	:arrow_up:

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