TBI - Add Freestyle OPA test templates and logic to ui5-test-writers

[kjose90]

Description (include screenshots)

• Add EJS templates to generate tests for fiori freestyle templates to ui5-test-writers.

• AddgenerateFreestyleOPAFiles function to write OPA tests.

/**
 * Configuration interface for generating freestyle OPA test files
 */
export interface FFOPAConfig {
    appId: string;    
    applicationTitle?: string;
    applicationDescription?: string;
    enableTypeScript?: boolean;
    viewName?: string;
    ui5Version?: string;
    ui5Theme?: string;
}


export async function generateFreestyleOPAFiles(
    basePath: string,
    opaConfig: FFOPAConfig,
    fs?: Editor,
    log?: Logger
): Promise<Editor>

• AddaddTests to FreestyleApp, appOptions, if addTests enabled - write OPA tests for fiori freestyle app.

export interface FreestyleApp<T> extends Ui5App {
    template: Template<T>;
    service?: OdataService & {
        capService?: CapServiceCdsInfo;
    };
    app: FioriApp;
    appOptions: Partial<AppOptions> & {
        /**
         * Generate OPA based tests, for Simple template.
         * This will eventually move up to {@link Ui5App.appOptions}
         */
        addTests?: boolean;
    };
}