changefeed: filter out the temporary table schema change

[tiancaiamao]

What problem does this PR solve?

We are implementing temporary table

Write on the temporary table do not generate any key-value to TiKV,
but for the global temporary table, the table meta data is generated.

Our local temporary table will be MySQL compatible.
Our global temporary table is an extension of MySQL, so it's not supposed to sync to a MySQL downstream.
This extension should make the CDC processing fail.

What is changed and how it works?

Filter the create global temporary table DDL changes.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Seems the integration test environment is so ... complex.
This is just one line change, could we skip the test?

Side effects

• Breaking backward compatibility

Update the parser, the model.Table is updated, this should not affect the compatibility because the lack of the field would be set the default value

Release note

• No release note

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[tiancaiamao]

Without changes, the behaviour is the same with other feature(like auto random etc):
Sync TiDB to MySQL with tidb-specific feature result in error.