feat: Add additional testOptions for xcuitest

[mhan83]

Proposed changes

Add additional testOptions for xcuitest on simulators.

SauceCTL Test option input	xcodebuild command	Notes
testTimeoutsEnabled: "Yes|No"	-test-timeouts-enabled [YES | NO]	By default there is no timeout, if enabled, then the timeout is 600 seconds. This can be changed by adding the defaultTestExecutionTimeAllowance value. See also https://developer.apple.com/documentation/xctest/xctestcase/3526064-executiontimeallowance
defaultTestExecutionTimeAllowance: 200 //in seconds	-default-test-execution-time-allowance seconds	The default execution time an individual test is given to execute if test timeouts are enabled. See also https://developer.apple.com/documentation/xctest/xctestcase/3526064-executiontimeallowance
maximumTestExecutionTimeAllowance 300 // in seconds	-maximum-test-execution-time-allowance seconds	The maximum execution time an individual test is given to execute, regardless of the test's preferred allowance. See also https://developer.apple.com/documentation/xctest/xctestcase/3526064-executiontimeallowance
testLanguage language	-testLanguage language	Specifies ISO 639-1 language during testing. See https://www.loc.gov/standards/iso639-2/php/code_list.php
testRegion region	-testRegion region	Specifies ISO 3166-1 region during testing, see also https://www.iso.org/obp/ui/#search

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Checklist

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have updated the json schema (if appropriate)

Further comments

Because reasons, TestOptions needs to be converted to a map[string]interface{} type. I opted to use reflection to do it for easier maintainability, but I could be easily convinced to not use reflection...