[CBRD-25446] relative lob locator for ES_POSIX

[kisoo-han]

http://jira.cubrid.org/browse/CBRD-25446

Description

• change LOB locator from absolute to relative
  • ASIS: file:/home/CUBRID/demo/lob/ces_473/image_t.00001720145971397885_2985
  • TOBE: file:ces_473/image_t.00001720145971397885_2985
• backword compatible
  • locator for the new lob record will be created in relative fasion
  • access existing absolute lob locator is possible
• when lob locator is relative path, lob-base-path will be added as the prefix

[kisoo-han]

@hornetmj 님의 빠르고 세심한 리뷰 감사드립니다. 이후에는 Draft PR을 적극 활용하겠습니다.