Fix SQL split string to include ;-less statements

[potiuk]

There was a bug in an incoming change to common-sql provider
introduced in #23971 where ;-less statements were removed
when "split_statements" flag was used. Since this flag is used
by default in Databricks statement, it introduced backwards
incompatible change.

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[potiuk]

cc: @kazanzhy@alexott

[potiuk]

@kazanzhy@alexott - I chose a little different approach than proposed in #25640 (comment) - after adding unit tests. I generaly filter out all empty statements during the split - that will even allow comment-only statements for example

[alexott]

lgtm

[kazanzhy]

Sorry for being offline. I tried to work on #25259 finally.

Initially, I took this code from the drill provider where it was like:

sql = sqlparse.split(sqlparse.format(self.sql, strip_comments=True))
no_term_sql = [s[:-1] for s in sql if s[-1] == ';']

which is the like current [s.rstrip(';') for s in splits if s.endswith(';')]

I tested it with different queries and even with comments and I see that I really missed the query like 'SELECT * FROM table;;;;;' and query without ;

[potiuk]

I think this one should be ready to review :).