Add context to gfpdf_core_template hook

[jakejackson1]

Description

Pass the $form, $entry, and $settings variables to the gfpdf_core_template hook so developers can conditionally display styles in any Core / Universal PDF template.

Also include form-specific hook gfpdf_core_template_$formId

Testing instructions

Implement https://docs.gravitypdf.com/v6/developers/actions/gfpdf_core_template but accept 3 arguments to the function, then conditionally display styles in the PDF. Verify the styles appear in the generated HTML.

Do the same for gfpdf_core_template_$formId

Screenshots

Checklist:

• [x] I've tested the code.
• [x] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [x] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1410 (8dfcb9c) into development (4a4155b) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@              Coverage Diff               @@
##             development    #1410   +/-   ##
==============================================
  Coverage          78.29%   78.30%           
  Complexity          2901     2901           
==============================================
  Files                243      243           
  Lines              10119    10120    +1     
  Branches             370      370           
==============================================
+ Hits                7923     7924    +1     
  Misses              2188     2188           
  Partials               8        8           

Impacted Files	Coverage Δ
src/View/html/PDF/core_template_styles.php	98.03% <100.00%> (+0.03%)	:arrow_up:

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