Jinja whitespace control improvements

[ThoSap]

Produces more readable oracle incremental merge/upsert statement

    merge into myschema.test target
      using myschema.o$pt_test120014 temp
      on (temp.my_pk = target.my_pk)
    when matched then
      update set
      target.col1 = temp.col1,
      target.col2 = temp.col2,
      target.col3 = temp.col3
      
    when not matched then
      insert( my_pk, col1, col2, col3 )
      values(
        temp.my_pk,
        temp.col1,
        temp.col2,
        temp.col3
        
      )

instead of

    merge into myschema.test target
      using myschema.o$pt_test120014 temp
      on (temp.my_pk = target.my_pk)
    when matched then
      update set
      
        target.col1 = temp.col1
        , 
      
        target.col2 = temp.col2
        , 
      
        target.col3 = temp.col3
        
      
    when not matched then
      insert( my_pk, col1, col2, col3 )
      values(
       
          temp.my_pk
          , 
       
          temp.col1
          , 
       
          temp.col2
          , 
       
          temp.col3
         
        
      )

[ThoSap]

I added one more change (not so important), sorry that I'm late with this one:
ThoSap@1b6bf8e