Make BaseOrListParam and BaseParam visible outside of the package

[ibacher]

This is just a simple PR to make BaseOrListParam and BaseParam visible outside the ca.uhn.fhir.rest.param package similar to how BaseAndListParam is. This is useful for creating more generic APIs.

[codecov]

Codecov Report

Merging #1710 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1710      +/-   ##
============================================
+ Coverage     79.52%   79.52%   +<.01%     
- Complexity    13531    13532       +1     
============================================
  Files           945      945              
  Lines         51383    51383              
  Branches       8304     8304              
============================================
+ Hits          40862    40863       +1     
+ Misses         7337     7336       -1     
  Partials       3184     3184

Impacted Files	Coverage Δ	Complexity Δ
...n/java/ca/uhn/fhir/rest/param/BaseOrListParam.java	92.85% <100%> (ø)	6 <1> (ø)	⬇️
...rc/main/java/ca/uhn/fhir/rest/param/BaseParam.java	90.47% <100%> (ø)	13 <1> (ø)	⬇️
.../java/ca/uhn/fhir/rest/param/QualifierDetails.java	76.66% <0%> (+1.66%)	26% <0%> (+1%)	⬆️

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