feat(diff): merge adjacent blocks using inline:word (#37085)

vim-patch:9.2.0174: diff: inline word-diffs can be fragmented

Problem:  When using 'diffopt=inline:word', lines were excessively
          fragmented with punctuation creating separate highlight
          blocks, making it harder to read the diffs.
Solution: Added 'diff_refine_inline_word_highlight()' to merge
          adjacent diff blocks that are separated by small gaps of
          non-word characters (up to 5 bytes by default) (HarshK97).

When using inline:word diff mode, adjacent changed words separated by
punctuation or whitespace are now merged into a single highlight block
if the gap between them contains fewer than 5 non-word characters.

This creates more readable diffs and closely matches GitHub's own diff
display.

closes: vim/vim#19098

https://github.com/vim/vim/commit/42c6686c78d39843f71dba989a8ea59bc6975132

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