Fixes #3489

Summary

This PR adds a proper default formatter for binary data (byte[] and ReadOnlyMemory) that displays data in a hexadecimal dump format with address offsets, hex values, and ASCII representation.

Motivation

Currently, byte arrays are displayed as simple lists of numbers, which makes it difficult to:

Quickly understand binary data structure

• Identify patterns in hex values
• See which bytes represent printable ASCII characters
• Debug binary protocols or file formats

Output format:

00000000  48 65 6C 6C 6F 20 57 6F  72 6C 64 21 00 FF AB CD  |Hello World!....|
00000010  01 02 03 04                                       |....|

Features

• Address offsets: 8 hex digits (e.g., 00000000, 00000010)
• Hex values: 16 bytes per line, grouped in 8-byte chunks for readability
• ASCII representation: Printable characters (32-126) shown, others as .
• Proper spacing: Extra space between byte groups, aligned ASCII column
• HTML support: Wraps output in <pre class="dni-binary"> tag
• Unit-tests added

Design Decisions

• 16 bytes per line: Industry standard for hex dumps (matches xxd, hex editors)
• 8-byte grouping: Helps identify 64-bit boundaries and improves readability
• Uppercase hex: Conventional and easier to distinguish from letters
• Null/empty handling: Null arrays show , empty arrays show nothing
• Non-breaking: Uses existing formatter infrastructure, no breaking changes