Do not enforce `connector` table property in `CREATE TABLE`

[ferenc-csaky]

There can be situations, when a CREATE TABLE statement might not contain a connector property. This is the case for example when you precreate an Iceberg catalog, and create table afterwards, so some props are inherited from the catalog itself.

Faulty scenario

CREATE CATALOG glue WITH (
    'type' = 'iceberg',
    'catalog-impl' = 'org.apache.iceberg.aws.glue.GlueCatalog',
    'io-impl' = 'org.apache.iceberg.aws.s3.S3FileIO'
    'warehouse' = 's3://...',
);

USE CATALOG glue;
USE my_glue_database;

CREATE TABLE my_table (
    str_col STRING,
    int_col INT
) WITH (
    'format-version' = '2'
);

Failure

Initializing build environment ...
Processing dependencies ...
Compiling SQRL script ...
java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.get(Optional.java:143)
	at com.datasqrl.planner.tables.FlinkConnectorConfig.getTableType(FlinkConnectorConfig.java:66)
	at com.datasqrl.planner.Sqrl2FlinkSQLTranslator.addTable(Sqrl2FlinkSQLTranslator.java:926)
	at com.datasqrl.planner.Sqrl2FlinkSQLTranslator.createTable(Sqrl2FlinkSQLTranslator.java:731)
	at com.datasqrl.planner.SqlScriptPlanner.planStatement(SqlScriptPlanner.java:308)
	at com.datasqrl.planner.SqlScriptPlanner.planMain(SqlScriptPlanner.java:225)
	at com.datasqrl.compile.CompilationProcess.executeCompilation(CompilationProcess.java:67)
	at com.datasqrl.cli.AbstractCompileCmd.compile(AbstractCompileCmd.java:94)
	at com.datasqrl.cli.AbstractCompileCmd.runInternal(AbstractCompileCmd.java:122)
	at com.datasqrl.cli.BaseCmd.run(BaseCmd.java:44)
	at picocli.CommandLine.executeUserObject(CommandLine.java:2045)
	at picocli.CommandLine.access$1500(CommandLine.java:148)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2469)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2461)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2423)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2277)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2425)
	at picocli.CommandLine.execute(CommandLine.java:2174)
	at com.datasqrl.cli.DatasqrlCli.main(DatasqrlCli.java:69)
[FATAL] No value present