Create individuals()

[sannegovaert]

fix #148

individuals() returns a tibble with the columns "individualID", "scientificName", "lifeStage" and "sex".
Only individuals with a individualID are returned.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.91%. Comparing base (180b088) to head (2600a67).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   99.91%   99.91%           
=======================================
  Files          25       26    +1     
  Lines        1140     1149    +9     
=======================================
+ Hits         1139     1148    +9     
  Misses          1        1           

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[peterdesmet]

• Fixed function title (a copy/paste error)
• Indicated in Camtrap DP that we could benefit from some named individuals in example dataset
• use expect_length(x, 3) rather than expect_equal(nrow(x), 3)

[peterdesmet]

Correction: expect_length(x, 3) cannot be used instead of expect_equal(nrow(x), 3), so I reverted that.