[core] Fix Identifier should parse backquote.

[LinMingQiang]

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When using flink procedure, table name can not parsed correctly when use `` quote.

But Spark request use `` for SYSTEM_TABLE_SPLITTER ($) . So this is incompatible with Spark.

e.g :

Flink is OK But Spark is ERR  :  CALL sys.create_branch('default.T$branch_branch1', ......)

Flink is ERR But Spark is OK :  CALL sys.create_branch('default.`T$branch_branch1`', ......)

Flink will parse `T$branch_branch1` to table is `T  and branch is branch_branch1`.

Why :

Flink use org.apache.paimon.catalog.Identifier to parse the tableName and miss processing backquote, spark use spark.sessionState().sqlParser().parseMultipartIdentifier to parse.

Purpose

Linked issue: close #xxx

Tests

API and Format

Documentation