[BUG] Grok command should raise better error when invalid regex is specified

[ykmr1224]

What is the bug?
When invalid regex is specified with Grok command, it raises raw error from Pattern.compile, but it should raise better error.

How can one reproduce the bug?
Steps to reproduce the behavior:
query: source=src | grok message 'updateStatus: updateStatus)'
error: java.util.regex.PatternSyntaxException: Unmatched closing ')' near index 26

What is the expected behavior?
It should raise error something like: `Invalid pattern specified to grok command: Unmatched closing ')' near index 26``

What is your host/environment?
Checked behavior with testSuite

Do you have any screenshots?
n/a

Do you have any additional context?
Check other command which use regex and fix in the same way.

[anasalkouz]

@YANG-DB can you please look into this?

[YANG-DB]

Yes thank you for raising this