feat(migrations): add initial migration setup and performance indexes

- Introduced .pgmrc.json and migrate.json for node-pg-migrate configuration.
- Added multiple migration files to create performance indexes for tasks and related entities.
- Implemented functions for optimized task sorting and manual progress tracking.
- Updated package.json to include migration scripts and dependencies for node-pg-migrate.
- Created README.md for migration guidelines and best practices.

worklenz-backend/database/sql/1_tables.sql

@@ -25,6 +25,13 @@ CREATE TABLE IF NOT EXISTS pg_sessions (
     expire TIMESTAMP(6) NOT NULL
 );
 
+-- Create pgmigrations table for node-pg-migrate
+CREATE TABLE IF NOT EXISTS pgmigrations (
+    id      SERIAL                              PRIMARY KEY,
+    name    VARCHAR(255)                        NOT NULL,
+    run_on  TIMESTAMP WITH TIME ZONE            NOT NULL
+);
+
 CREATE TABLE IF NOT EXISTS project_access_levels (
     id   UUID DEFAULT uuid_generate_v4() NOT NULL,
     name TEXT                            NOT NULL,