Add configurable boolean-to-numeric conversion for ResultSet getters

[vwassan]

Addresses: #367

Problem:

When calling numeric getters (getByte(), getInt(), getLong(), getShort(), getFloat(), getDouble(), getBigDecimal()) on PostgreSQL boolean columns, the driver
throws PSQLException: Bad value for type byte : f.

Solution:

Added a new connection property convertBooleanToNumeric that enables automatic conversion of PostgreSQL boolean values to numeric types:

• 't' → 1
• 'f' → 0
• Works with boolean columns
• Property cached per connection for optimal performance
• Boolean column type detection prevents false positive conversions

Usage:

// JDBC URL
jdbc:postgresql://host:5432/db?convertBooleanToNumeric=true

// HikariCP
config.addDataSourceProperty("convertBooleanToNumeric", "true");

// Spring Boot
spring.datasource.hikari.data-source-properties.convertBooleanToNumeric=true

Backward Compatibility:

• Default: false (maintains existing behavior)
• getBoolean() continues working regardless of property setting
• No changes to existing application behavior unless explicitly enabled

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Does ./gradlew styleCheck pass ?
3. Have you added your new test classes to an existing test suite in alphabetical order?

Changes to Existing Features:

• Does this break existing behaviour? If so please explain.
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?

[davecramer]

The conversions by ResultSet getter methods says get Float, Double, and BigDecimal should support this

[vwassan]

@davecramer Made the changes. One SSL-related test on CI is failing. Not sure about it.