Adagio Rtd Provider: add placementSource param

[osazos]

Type of change

• Feature
• Updated RTD provider

Description of change

• Add a config param to define a source to programmatically set the value of ortb2Imp.ext.data.placement signal
• Remove the behavior that was to always fallback on the ad-unit code value, but only when reading the Adagio params in adUnits[].bids[]

Other information

Updated doc: prebid/prebid.github.io#5415

[github-actions]

Whoa there, partner! 🌵🤠 We wrangled some duplicated code in your PR:

• modules/adagioRtdProvider.js has 8 duplicated lines with modules/adagioRtdProvider.js
• modules/adagioRtdProvider.js has 19 duplicated lines with modules/bliinkBidAdapter.js

Reducing code duplication by importing common functions from a library not only makes our code cleaner but also easier to maintain. Please move the common code from both files into a library and import it in each. Keep up the great work! 🚀

[github-actions]

Whoa there, partner! 🌵🤠 We wrangled some duplicated code in your PR:

• modules/adagioRtdProvider.js has 8 duplicated lines with modules/adagioRtdProvider.js
• modules/adagioRtdProvider.js has 19 duplicated lines with modules/bliinkBidAdapter.js
• modules/adagioBidAdapter.js has 15 duplicated lines with modules/adagioRtdProvider.js

Reducing code duplication by importing common functions from a library not only makes our code cleaner but also easier to maintain. Please move the common code from both files into a library and import it in each. Keep up the great work! 🚀

[patmmccann]

Hey @osazos I merged your other two pr's, can you clean up the last duplication issue on this one by moving

Prebid.js/modules/adagioRtdProvider.js

Line 54 in 73536a6

const _ADAGIO = (function() {

into /libraries/adagioUtils/ ?