refactor: Replace private usages of Guava Collections API with Java Collections API

[valfirst]

Change list

Public API based on Guava Collections API is not changed (it's already deprecated):

java-client/src/main/java/io/appium/java_client/MobileCommand.java

Lines 437 to 471 in 79c6c0c

	/**
	* Prepares single argument.
	*
	* @param param is a parameter name.
	* @param value is the parameter value.
	* @return built {@link ImmutableMap}.
	* @deprecated Use {@link Map#of(Object, Object)}
	*/
	@Deprecated
	public static ImmutableMap<String, Object> prepareArguments(String param,
	Object value) {
	ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
	builder.put(param, value);
	return builder.build();
	}
	/**
	* Prepares collection of arguments.
	*
	* @param params is the array with parameter names.
	* @param values is the array with parameter values.
	* @return built {@link ImmutableMap}.
	* @deprecated Use {@link Map#of(Object, Object, Object, Object)}
	*/
	@Deprecated
	public static ImmutableMap<String, Object> prepareArguments(String[] params,
	Object[] values) {
	ImmutableMap.Builder<String, Object> builder = ImmutableMap.builder();
	for (int i = 0; i < params.length; i++) {
	if (!isNullOrEmpty(params[i]) && values[i] != null) {
	builder.put(params[i], values[i]);
	}
	}
	return builder.build();
	}

Types of changes

What types of changes are you proposing/introducing to Java client?
Put an x in the boxes that apply

• No changes in production code.
• 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)

[mykola-mokhnach]

I prefer to use var