fix(sqlite): read the definition of the first column when introspecting a table - #8518

SQLite introspection finds each column's definition in the create table SQL with a regex that expects a comma before the column name. The first column has none, so its collation, inline check (including enum items) and generated expression were never read. The entity generator dropped them, introspection threw Cannot read properties of undefined (reading 'definition') when the first column was generated, and a collated or enum primary key (or a pivot FK column that copies its collation) made getUpdateSchemaSQL() return a table rebuild right after schema.create() instead of an empty string:

create table `country__temp_alter` (`code` text collate NOCASE not null primary key, `name` text not null);
insert into `country__temp_alter` select `code`, `name` from `country`;
drop table `country`;
alter table `country__temp_alter` rename to `country`;

The regex now also matches the column at the start of the column list. Other columns still need the leading comma.