Add Doc parameters and overhaul rendering options

[DavidGregory084]

This PR adds Doc.param, which can be used to introduce named parameters into prettier4j's Doc.

These named parameters must be bound using Doc#bind before rendering.

This is useful when using Doc to represent error messages which contain pretty-printed elements like source code snippets or in type errors when printing out actual and expected types, as it allows an instance of Doc with placeholders to be declared and later bound with parameters for rendering.

It also overhauls rendering options in an attempt to avert any further changes to the render functions as more options are added.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.18182% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 96.83%. Comparing base (61667de) to head (c67ffd5).

Files	Patch %	Lines
...main/java/com/opencastsoftware/prettier4j/Doc.java	85.55%	12 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #80      +/-   ##
============================================
- Coverage     97.78%   96.83%   -0.95%     
- Complexity      211      236      +25     
============================================
  Files            10       11       +1     
  Lines           632      727      +95     
  Branches        109      125      +16     
============================================
+ Hits            618      704      +86     
- Misses            6       18      +12     
+ Partials          8        5       -3     

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