repl: add block-based history navigation

[hemanth]

Description

When recalling a multiline entry from history, the Up and Down arrow
keys now navigate between history entries as whole blocks rather than
moving line-by-line within a recalled entry.

Previously, recalling a multiline function from history and pressing
Up would move the cursor within that entry's lines before advancing
to the previous history entry. With this change, Up/Down always jump
directly to the previous/next history entry, matching the behavior
of Ctrl-P/Ctrl-N.

Example

> function add(a, b) {
... return a + b;
... }
undefined
> // press Up arrow once — jumps to the full 'function add' block, not just last line

Fixes: #48146

[nodejs-github-bot]

Review requested:

• @nodejs/config

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (9041ad0) to head (3f0786d).

Additional details and impacted files

@@ Coverage Diff @@## main #64477 +/- ##
==========================================
- Coverage 90.12% 90.10% -0.03% 
==========================================
Files 743 743 Lines 242324 242338 +14 Branches 45629 45630 +1 ==========================================
- Hits 218396 218349 -47 - Misses 15440 15498 +58 - Partials 8488 8491 +3 

Files with missing lines	Coverage Δ
lib/repl.js	93.00% <100.00%> (+0.07%)	⬆️

... and 30 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.