Format with google-java-format (via spotless)

[robinst]

Using AOSP style because:

• It's 4 spaces indentation (instead of 2 for the default). 4 spaces matches
  the current style, so reformatting isn't going to change all lines.
• It's also closer to OpenJDK's own style as commonmark-java is vendored there:
  https://github.com/openjdk/jdk/tree/master/src/jdk.internal.md/share/classes/jdk/internal/org/commonmark

Can check formatting with mvn spotless:check and run formatting with mvn spotless:apply. We could add the check to CI at some point, but yeah.

[codecov]

Codecov Report

❌ Patch coverage is 90.08811% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.76%. Comparing base (9477a93) to head (bb8c71f).

Files with missing lines	Patch %	Lines
...java/org/commonmark/internal/InlineParserImpl.java	85.00%	3 Missing and 3 partials ⚠️
...c/main/java/org/commonmark/internal/Delimiter.java	20.00%	4 Missing ⚠️
...main/java/org/commonmark/node/FencedCodeBlock.java	0.00%	4 Missing ⚠️
.../main/java/org/commonmark/parser/beta/Scanner.java	0.00%	4 Missing ⚠️
...commonmark/renderer/html/CoreHtmlNodeRenderer.java	42.85%	0 Missing and 4 partials ⚠️
...src/main/java/org/commonmark/node/OrderedList.java	0.00%	3 Missing ⚠️
...t/footnotes/internal/FootnoteHtmlNodeRenderer.java	91.30%	0 Missing and 2 partials ⚠️
.../src/main/java/org/commonmark/node/SourceSpan.java	66.66%	1 Missing and 1 partial ⚠️
.../commonmark/renderer/text/TextContentRenderer.java	33.33%	2 Missing ⚠️
...rk/ext/footnotes/internal/FootnoteBlockParser.java	85.71%	0 Missing and 1 partial ⚠️
... and 13 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #444      +/-   ##
============================================
- Coverage     94.78%   94.76%   -0.02%     
- Complexity      420      423       +3     
============================================
  Files           156      156              
  Lines          5174     5313     +139     
  Branches        757      788      +31     
============================================
+ Hits           4904     5035     +131     
- Misses          137      144       +7     
- Partials        133      134       +1     

Files with missing lines	Coverage Δ
...org/commonmark/ext/autolink/AutolinkExtension.java	68.42% <ø> (ø)
...java/org/commonmark/ext/autolink/AutolinkType.java	100.00% <ø> (ø)
...k/ext/autolink/internal/AutolinkPostProcessor.java	92.18% <100.00%> (-0.24%)	⬇️
...g/commonmark/ext/footnotes/FootnoteDefinition.java	100.00% <ø> (ø)
...rg/commonmark/ext/footnotes/FootnoteReference.java	100.00% <ø> (ø)
...g/commonmark/ext/footnotes/FootnotesExtension.java	100.00% <100.00%> (ø)
...a/org/commonmark/ext/footnotes/InlineFootnote.java	100.00% <100.00%> (ø)
.../ext/footnotes/internal/FootnoteLinkProcessor.java	100.00% <100.00%> (ø)
...otnotes/internal/FootnoteMarkdownNodeRenderer.java	97.05% <ø> (ø)
...main/java/org/commonmark/ext/gfm/alerts/Alert.java	100.00% <ø> (ø)
... and 128 more

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