Release version 0.43.0

[bgunebakan]

Summary of the changes / Why this is an improvement

• Types: Improved support for FLOAT type, converging to FLOAT vs. DOUBLE
• Types: Added method ObjectArray.as_generic for better reverse type lookups
• Types: Improved type mappings for better reverse type lookups / reflections
  • Consequently used upper-case type definitions from sqlalchemy.types
  • Added timestamp without time zone types (scalar and array)
  • On SQLAlchemy 2, mapped real and double{_precision} types to the
    newly introduced sqltypes.{DOUBLE,DOUBLE_PRECISION} types
• Compiler: Made CREATE INDEX a no-op, only emitting SELECT 1, because CrateDB
  does not support that statement
• Compiler: Fixed AttributeError: 'CrateCompilerSA20' object has no attribute 'visit_on_conflict_do_update' by forwarding calls to
  PGCompiler.visit_on_conflict_do_update
• Dialect: Added methods concerned with isolation levels as no-ops
• Types: Started emulating PostgreSQL's JSON(B) types using CrateDB's OBJECT
• Dialect: now uses paramstyle = "pyformat" supported in crate-python 2.2.1.
  Because of this the SQL statements logged or inspected will contain
  %(name)s placeholders instead of ?.
• Removed support for Python versions < 3.10

Checklist

• Link to issue this PR refers to (if applicable): Fixes sqlalchemy-cratedb 0.43 release #258

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