feat: add z.ipv4Range() and z.ipv6Range() validation

[wataryooou]

Closes #2758

This PR introduces ipv4Range and ipv6Range validation schemas that check if an IP address falls within a specified CIDR range.

API

// Standalone schemas (recommended)
z.ipv4Range("192.168.1.0/24").parse("192.168.1.10");  // ✅
z.ipv4Range("192.168.1.0/24").parse("192.168.2.10");  // ❌

z.ipv6Range("2001:db8::/32").parse("2001:db8::1");    // ✅
z.ipv6Range("fe80::/10").parse("fe80::1");            // ✅

// Method chaining
z.string().ipv4Range("10.0.0.0/8")
z.string().ipv6Range("::1/128")

// Custom error message
z.ipv4Range("192.168.1.0/24", "IP must be in private range")

Features

• Validates both IP format and range inclusion in a single check
• Throws at schema construction time for invalid CIDR prefix length
• Supports IPv4 prefix 0-32 and IPv6 prefix 0-128
• Full :: notation support for IPv6

Additional Notes

These features were initially implemented in this PR (#3754) before zod v4, but we've refactored the PR to resolve conflicts and align with the zod4 (and mini) syntax conventions.

[pullfrog]

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