Snow 802269 add locate, randn and ntile functions

[sfc-gh-gmahadevan]

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1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes #802269

2. Fill out the following pre-review checklist:

   • [X] I am adding a new automated test(s) to verify correctness of my new code
   • [ ] I am adding new logging messages
   • [ ] I am adding a new telemetry message
   • [ ] I am adding new credentials
   • [ ] I am adding a new dependency

3. Please describe how your code solves the related issue.

   Add locate, randn and ntile functions for scala and java which takes column name as both ColumnType and StringType

API	Description
functions.locate	Locate the position of the first occurrence of substr in a string column
functions.ntile	NTILE
funstions.randn	Generate Random number

Pre-review checklist

(For Snowflake employees)

• [X] This change has passed precommit
• [ ] I have reviewed code coverage report for my PR in (Sonarqube)