Snow 802269 add log10, log1p, base64 and unbase64 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:

   • 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 log10 and log1p functions for scala and java which takes column name as both ColumnType and StringType

API	Description
function.log10	Computes the logarithm of the given column in base 10
functions.log1p	Computes the natural logarithm of the given value plus one
functions.base64	Computes the BASE64 encoding of a column and returns it as a string column.
functions.unbase64	Decodes a BASE64 encoded string column and returns it as a column.

Pre-review checklist

(For Snowflake employees)

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

[sfc-gh-bli]

LGTM