[FEATURE] Use SQL CLI tool from pipy in doctest gradle task

[Yury-Fridlyand]

Is your feature request related to a problem?

sql/doctest/build.gradle

Lines 22 to 33 in 9d4a841

	task cloneSqlCli(type: Exec) {
	// clone the sql-cli repo locally
	commandLine 'git', 'clone', 'https://github.com/opensearch-project/sql-cli.git'
	}
	task bootstrap(type: Exec, dependsOn: ['cloneSqlCli']) {
	inputs.file "$projectDir/bootstrap.sh"
	outputs.dir "$projectDir/.venv"
	commandLine 'sh', "$projectDir/bootstrap.sh"
	}

Currently, doctest gradle task clones sql-cli repo.

What solution would you like?
Install sql cli tool from pipy using pip.

What alternatives have you considered?
N/A

Do you have any additional context?
Make doctest more robust too. It can't start if it crashed or interrupted by Ctrl+C without manual cleanup.