primaryKey
 Note: to specify non-standard column names, use primaryKey(Token, Token...) with Token.literal(String)
- Parameters:
- firstColumn- the first column of the primary key, will be tokenized, for example "myColumn" will reference column "my_column" for MariaDb
- columns- the rest of the columns of the primary key, will be tokenized, for example "myColumn" will reference column "my_column" for MariaDb
- Returns:
- this builder, for chaining. Remember to call IBaseBuilder.execute()