Introduce new command to run manual scripts

[samirsilwal]

Changes

• Introduce new command run-script
• Accepts --file as flag
• Can be used to run manual scripts in JS/TS or SQL
• For SQl, simply run the script present in the given file
• For JS/TS, a function main is expected to be exported which gets knex connection and identifier as args. example

export async function main(conn: Knex.Transaction, id: string) {
  await conn.......

  log(`Completed script for ${id}`)
}

• Other existing flags like --only -> to run script for specific connection and --dry-run -> to dry run the script works as usual
• Update unit tests

Todo

• Update readme
• Add demo ss

[SafalPandey]

Let's not name things as manual here. Just getScriptPath should be good.