Add iOS IMO HD chat message custom parser plugin

[agusgiinarsa]

One line description of pull request

Add iOS IMO HD chat message custom parser plugin

Description:

In this pull request I add several files : • Add file plaso/parsers/sqlite_plugins/ios_imohdchat_message.py • Add one line at plaso/parsers/sqlite_plugins/init.py • Add file plaso/tests/parsers/sqlite_plugins/ios_imohdchat_message.py • Add file plaso/test_data/IMODb2.sqlite to use as test data (from iOS forensic image in Digital Corpora)

Related issue (if applicable): fixes #

Notes:

All contributions to Plaso undergo code review. This makes sure that the code has appropriate test coverage and conforms to the Plaso style guide.

One of the maintainers will examine your code, and may request changes. Check off the items below in order, and then a maintainer will review your code.

Checklist:

• [x] Automated checks (GitHub Actions, AppVeyor) pass
• [x] No new new dependencies are required or l2tdevtools has been updated
• [x] Reviewer assigned
• [ ] Test data has a Plaso compatible license