Add new function: get_bibliography()

[PietrH]

• Added a new function get_bibliography() that creates a data.frame of references based on a detections-like input data.frame.
• Refactored check_value() to no longer use assertthat, and offer a shorter and more stylish message. When possible, offering suggestions for possible typo's:

check_value("2001_Loire", list_acoustic_project_codes(), name = "acoustic_project_code")
Error:
! Can't find acoustic_project_code: "2001_Loire" in: "2004_Gudena",
"2011_bovenschelde", "2011_Loire", …, "zeeschelde", or "ZRM_network". Did you mean
"2011_Loire"?

• This change only affects check_value() calls on the client, I have not made any changes to {etnservice} which retains the same behavior as before this PR. This means that the messages generated by the API will remain very long (include all possible candidate codes) and will offer no suggestions. I can not inherit this function, because all OpenCPU messages are fetched as pure text, and the etn R package uses {cli}.
• Is this change to the error messaging worth mentioning in NEWS?
• Updated related documentation and field_definitions.tsv
• The resulting bibliography now refers to the R package and the ETN data platform by it's paper. Both of these references are hard coded, for the R package only the version number automatically updates. I had a lot of trouble getting the output of citation("etn") to be consistent over platforms, and to get it into the shape that I wanted. So we ended up landing on hardcoding it in.
• I might have to add a bit more to field_definitions.tsv, what do you think?
• I've used the qs2 serializer for test fixtures (cached HTTP responses) to save space. See: https://qsbase.r-universe.dev/articles/qs2/vignette.html, related to Reduce package size: fixtures are quite big #491

[codecov]

Codecov Report

❌ Patch coverage is 97.43590% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.05%. Comparing base (3a12c56) to head (ff43e93).

Files with missing lines	Patch %	Lines
R/utils.R	93.18%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
+ Coverage   94.80%   95.05%   +0.25%     
==========================================
  Files          33       34       +1     
  Lines        1559     1639      +80     
==========================================
+ Hits         1478     1558      +80     
  Misses         81       81              

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