Fix spinner animation blocking user input in diagnostic tool

[parthosa]

Fixes #630. This PR fixes spinner animation in diagnostic tool as it interferes with the user input.

Changes:

1. Add pause() and resume() methods in ToolsSpinner.
2. Store the spinner as a class variable and toggle it later.
3. Update the logging - write to log only if user input is skipped (using -y flag), else print to console and ask for user input.
4. Fix cursor getting disappeared by using the flag hide_cursor=False in the spinner.

Output

1. Default mode and user input is required

psarthi@work:~/tools_dir/$ spark_rapids_user_tools dataproc diagnostic --cluster test-cluster
Processing...⢿
This operation will collect sensitive information from your cluster, such as OS & HW info, Yarn/Spark configurations and log files etc.
Do you want to continue (yes/no): yes
Processing...⣻
Processing Completed!

2. Default mode and user input is skipped

psarthi@work:~/tools_dir/$ spark_rapids_user_tools dataproc diagnostic --cluster test-cluster -y
Processing...⣻
Processing Completed!

3. Verbose/Debug mode and user input is required.

psarthi@work:~/tools_dir/$ spark_rapids_user_tools dataproc diagnostic --cluster test-cluster -v
...
INFO rapids.tools.diagnostic.ctxt: Local output folder is set as: /home/psarthi/tools_dir/xyz
DEBUG rapids.tools.diagnostic: Set thread number as: 3
This operation will collect sensitive information from your cluster, such as OS & HW info, Yarn/Spark configurations and log files etc.
Do you want to continue (yes/no): yes
INFO rapids.tools.diagnostic: ======= [Process-Arguments]: Finished =======
INFO rapids.tools.diagnostic: ******* [Execution]: Starting *******
...

4. Verbose/Debug mode and user input is skipped

psarthi@work:~/tools_dir/$ spark_rapids_user_tools dataproc diagnostic --cluster test-cluster -v -y
...
INFO rapids.tools.diagnostic.ctxt: Local output folder is set as: /home/psarthi/tools_dir/xyz
DEBUG rapids.tools.diagnostic: Set thread number as: 3
WARNING rapids.tools.diagnostic: This operation will collect sensitive information from your cluster, such as OS & HW info, Yarn/Spark configurations and log files etc.
INFO rapids.tools.diagnostic: Confirmed by command line option.
INFO rapids.tools.diagnostic: ======= [Process-Arguments]: Finished =======
INFO rapids.tools.diagnostic: ******* [Execution]: Starting *******
...

[cindyyuanjiang]

LGTM