Update version to 2.1.0

[qiaoyuang]

sqllin-dsl

• Support typealias of supported types(primitive types, String, ByteArray etc) in generated tables
• Support enumerated types in DSL APIs, includes =, !=, <, <=, >, >= operators
• Support <, <=, >, >=, IN, BETWEEN...AND operators for String
• Support =, !=, <, <=, >, >=, IN, BETWEEN...AND operators for ByteArray
• Add a new condiction function ISNOT for Boolean, and IS starts to support to receive a nullable parameter
• Refactored CREATE statements building process, move it from runtime to compile-time.
• New experimental API for COLLATE NOCASE keyword: CollateNoCase
• New experimental API for single column with UNIQUE keyword: Unique
• New Experimental API for composite column groups with UNIQUE keyword: CompositeUnique