Mark user-facing methods public

[timholy]

public was added in Julia 1.11 and the ExplicitImports package allows one to check whether a package only accesses public names in its dependencies. I've been finding this a useful addition to many of my packages. The help string now shows

help?> JSON.parsefile
  │ Warning
  │
  │  The following bindings may be internal; they may change or be removed in future versions:
  │
  │    •  JSON.parsefile

  See parse.

This should silence the warning and allow ExplicitImports tests in other packages that use JSON to pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.26%. Comparing base (19025cc) to head (a53d5eb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #461   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files           7        7           
  Lines        1397     1397           
=======================================
  Hits         1261     1261           
  Misses        136      136           

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