Planner: Support "select from model where input in (...)"

[ea-rus]

Support multiple model calls in selecting from predictor with using IN statement.

This select

SELECT * FROM model 
WHERE a IN (100,101) 

Should call model twice, with two inputs and return two records in output. Equivalent calls:

SELECT * FROM model WHERE a = 100;
SELECT * FROM model WHERE a = 101;

Edge cases

1. second field is constant

SELECT * FROM model WHERE a IN (100,101) and b = 1

is converted to:

SELECT * FROM model WHERE a = 100 and b = 1;
SELECT * FROM model WHERE a = 101 and b = 1;

2. second field is list of equal length

SELECT * FROM model WHERE a IN (100,101) and b IN (1,2)

is converted to:

SELECT * FROM model WHERE a = 100 and b = 1;
SELECT * FROM model WHERE a = 101 and b = 2;

3. second field is list of different length

SELECT * FROM model WHERE a IN (100,101) and b IN (1,2,3)

raises an error

4. first field is subselect

SELECT * FROM model WHERE a IN (select a from table1)

Raise not supported ? To be able to handle this case this logic should be implemented in mindsdb.