Add Coverity scan

[omalyshe]

Description

This adds the Coverity scan for the project https://scan.coverity.com/projects/oneapi-src-onetbb.
It also add the badge to README file.

There is a limitation for the # of runs per day/week. For oneTBB project the following is applicable: Up to 21 builds per week, with a maximum of 3 builds per day, for projects with 100K to 500K lines of code
So, we'll run only on merge to master.

Fixes # - issue number(s) if exists

Type of change

Choose one or multiple, leave empty if none of the other choices apply

Add a respective label(s) to PR if you have permissions

• bug fix - change that fixes an issue
• new feature - change that adds functionality
• tests - change in tests
• infrastructure - change in infrastructure and CI
• documentation - documentation update

Tests

• added - required for new features and some bug fixes
• not needed

Documentation

• updated in # - add PR number
• needs to be updated
• not needed

Breaks backward compatibility

• Yes
• No
• Unknown

Notify the following users

List users with @ to send notifications

Other information