(CLI) Add -p short option for ivpn connection -pause

[naltun]

PR type

What kind of change does this PR introduce?

This updates ivpn connection flag options to include ivpn connection -p as a short option for -pause.

• Feature

PR checklist

Please check if your PR fulfills the following requirements:

• I have read the CONTRIBUTING.md doc
• The Git workflow follows our guidelines: CONTRIBUTING.md#git
• I have added necessary documentation (if appropriate)

What is the current behavior?

To pause a connection, the -pause option is required.

Issue number: N/A

What is the new behavior?

The -p option exists.

Here's a demonstration:

Does this PR introduce a breaking change?

• Yes
• No

Other information