Add HIRO Media adapter

[ronenst]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other

Description of change

New adapter and unit tests for HIRO Media

• test parameters for validating bids

By default only 300x250 will have bid requests sent

{
  bidder: 'hiromedia',
  params: {
    accountId: 'test'
  }
}

• contact email of the adapter’s maintainer
  support@hiro-media.com
• official adapter submission

[jaiminpanchal27]

Looks good. Thanks @ronenst

[mkendall07]

thanks @ronenst for the contribution. Can you please submit a PR here https://github.com/prebid/prebid.github.io/tree/master/dev-docs/bidders to add your adapter settings to documentation? THanks

[ronenst]

Thank you for the review and merge!

We'll submit a PR for the documentation.