Added 'RDataTmp' files to Rbuildignore and .gitignore

[henriquesposito]

Description

These patch changes fix issues with 'RDataTmp' files for CRAN submission.

Package

• Added 'RDataTmp' files to Rbuildignore and .gitignore
• Updated ´data_evolution()´ to use ´inherits()´ instead of ´class()´ for condition comparison

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #246 (f4bf2f6) into main (a755a96) will not change coverage. The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main     #246   +/-   ##
=======================================
  Coverage   71.69%   71.69%           
=======================================
  Files           9        9           
  Lines         869      869           
=======================================
  Hits          623      623           
  Misses        246      246           

Impacted Files	Coverage Δ
R/data_report.R	73.71% <0.00%> (ø)
R/treaties_retrieve.R	72.72% <100.00%> (ø)

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