feat(type): add support for Decimal type in database #66
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The database schema has been updated to support the Decimal data type. This includes casting from and to Decimal type in the DataValue structure, creating a new Decimal field in both LogicalType and DataValue structures, and adding appropriate match arms in the from_sqlparser_data_type and can_implicit_cast functions. A new error type for when an attempted conversion from Decimal fails have also been implemented. The round_dp_with_strategy method is used to provide flexibility with scale modification and rounding strategy when casting to Decimal type. Tests for the new functionality have been added as well.
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