Add OracleDialect to the independent SQL dialects module

[Copilot]

The src/dialects/ module was missing an Oracle formatter alongside the existing SQLite, MySQL, MSSQL, and PostgreSQL ones.

Changes

• src/dialects/oracle.js — new OracleDialect extends SqlFormatter implementing Oracle-specific SQL:

  • Pagination via OFFSET n ROWS FETCH NEXT n ROWS ONLY (Oracle 12c+)
  • "double-quoted" identifier escaping
  • Date parts with EXTRACT(... FROM ...), date truncation with TRUNC()
  • Null coalescing with NVL(), string cast with TO_CHAR()
  • Numeric casts as NUMBER(p,s), boolean as NUMBER(1,0)
  • REGEXP_LIKE() for regex, LOWER(RAWTOHEX(SYS_GUID())) for UUID generation
  • $toGuid via DBMS_CRYPTO.HASH (MD5-based, deterministic)
  • $getDate mapped to TRUNC(SYSDATE) / SYSDATE / SYSTIMESTAMP

• src/dialects/index.js — exports OracleDialect

• spec/SqlDialects.spec.js — 31 Oracle-specific tests; OracleDialect added to shared cross-dialect assertions

Usage

import { OracleDialect } from '@themost/query';

const formatter = new OracleDialect();

formatter.formatLimitSelect(query);
// SELECT "ProductData"."id" AS "id" FROM "ProductData" OFFSET 20 ROWS FETCH NEXT 10 ROWS ONLY

formatter.$year({ $name: 'createdAt' });   // EXTRACT(YEAR FROM "createdAt")
formatter.$ifNull({ $name: 'desc' }, ''); // NVL("desc", '')
formatter.$toString({ $name: 'price' });  // TO_CHAR("price")

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