Add configurable options support for redpen linter (#5006)

Redpen linter previously had hardcoded command-line options and duplicated
linter definitions across all supported file types (asciidoc, markdown,
review, rst, tex, text). This refactoring centralizes the linter definition
and adds support for user-configurable options via g:ale_redpen_options.

Key changes:
- Created ale#handlers#redpen#DefineLinter() to eliminate code duplication
- Added ale#handlers#redpen#GetCommand() to support configurable options
- All file types now use shared configuration and command building
- Added comprehensive test coverage for option handling
- Updated documentation for all affected file types

This allows users to customize redpen behavior with additional command-line
options while maintaining backward compatibility and reducing maintenance
overhead.

ale_linters/asciidoc/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('asciidoc', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f asciidoc -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('asciidoc')

ale_linters/markdown/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('markdown', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f markdown -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('markdown')

ale_linters/review/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('review', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f review -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('review')

ale_linters/rst/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('rst', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f rest -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('rst')

ale_linters/tex/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('tex', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f latex -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('tex')

ale_linters/text/redpen.vim

@@ -1,9 +1,4 @@
 " Author: rhysd https://rhysd.github.io
 " Description: Redpen, a proofreading tool (http://redpen.cc)
 
-call ale#linter#Define('text', {
-\   'name': 'redpen',
-\   'executable': 'redpen',
-\   'command': 'redpen -f plain -r json %t',
-\   'callback': 'ale#handlers#redpen#HandleRedpenOutput',
-\})
+call ale#handlers#redpen#DefineLinter('text')