Updated ´consolidate()´ to use two keys joining memberships' databases

[henriquesposito]

Description

These path changes update how ´consolidate()´ joins memberships' databases across 'many' packages. These changes update the keys used to join datasets in databases to avoid false duplication. These changes also allow for better visualisation of memberships' databases and make merging these over 100 times faster.

Connection

• Updated ´consolidate()´ to require two keys when joining memberships' databases
• Updated ´db_comp()´ to follow consolidation defaults for memberships' databases
• Closed #231 by adding a ´retrieve_texts()´ function to retrieve treaty texts from other 'many' packages

Checklist:

• [x] PR form
  • [x] I have given this pull request an informative title
  • [x] Description above itemizes changes under subtitles, e.g. "## Collection""
  • [x] Any closed, fixed, or related issues are referenced and explained in the description above, e.g. "Fixed #0 by adding A"
  • [x] Package builds on my OS without issues
• [x] PR checks all pass for latest commit
  • [x] Package builds on Mac
  • [x] Package builds on Windows
  • [x] Package builds on Linux
  • [x] CodeCov check: Package improves or maintains good test coverage
  • [x] CodeFactor check: Package improves or maintains good style
• [x] Documentation
  • [x] Any new or modified functions or data have roxygen style documentation in their .R scripts
  • [x] Any longer functions are commented inline so that it is easier to debug in the future
  • [x] PR description above and the NEWS.md file are aligned
  • [x] DESCRIPTION file version is bumped by the appropriate increment (major, minor, patch)

[codecov[bot]]

Codecov Report

Merging #247 (c2fc5da) into main (f4bf2f6) will increase coverage by 1.17%. The diff coverage is 85.96%.

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
+ Coverage   71.69%   72.86%   +1.17%     
==========================================
  Files           9        9              
  Lines         869      866       -3     
==========================================
+ Hits          623      631       +8     
+ Misses        246      235      -11     

Impacted Files	Coverage Δ
R/package_get.R	0.00% <ø> (ø)
R/releases_plot.R	68.04% <ø> (ø)
R/treaties_retrieve.R	68.42% <64.70%> (-4.31%)	:arrow_down:
R/consolidate.R	96.27% <70.58%> (+3.96%)	:arrow_up:
R/db_profile.R	94.54% <93.75%> (+7.15%)	:arrow_up:

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