Close #1699: support regex flags in tags.Pattern

[knoan]

Summary

Adds support for regex flags in tags.Pattern, addressing #1699.

Type tag syntax

// Case-insensitive matching
type CaseInsensitive = string & typia.tags.Pattern<"^hello$", "i">;

// Unicode property escapes (requires 'u' flag)
type Identifier = string & typia.tags.Pattern<"^[\\p{ID_Start}_$][\\p{ID_Continue}_$]*$", "u">;

Comment tag syntax

/** @pattern /^hello$/i */
caseInsensitive: string;

Changes

• Extended Pattern<Value, Flags> type with optional second parameter for flags
• Updated MetadataCommentTagFactory to parse regex literal syntax /pattern/flags
• Updated RandomProgrammer to pass flags to RegExp constructor
• Added x-pattern-flags schema extension for JSON schema output
• Added test structures for both type tag and comment tag syntax

Closes #1699

[pkg-pr-new]

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npm i https://pkg.pr.new/typia@1701

commit: 85ec09d

[samchon]

Have to be careful due to JSON schema reason. I will consider the way