[Improvement]: Optimize the naming of database/table methods in catalog

[xleoken]

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What would you like to be improved?

Optimize the naming of database/table methods in AmoroCatalog and ServerCatalog.
rename boolean exists(String database); to boolean databaseExists(String database);
rename boolean exists(String database, String table); to boolean tableExists(String database, String table);

How should we improve?

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Are you willing to submit PR?

• Yes I am willing to submit a PR!

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