feat: Add support for Bitbucket provider in gitprovider

[chamodshehanka]

Closes: #2569

Added support for Bitbucket provider in gitprovider.
For now I opened a WIP PR

TODO

• Complete the convertBitbucketPR function
• Handle the interface{} type - The Bitbucket library returns interface{} for some fields. You need to properly type assert these fields to extract the necessary information
• Test the implementation

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[chamodshehanka]

@krancour could you please help/guide me to up and running this in local, so can test this implementation?

Thanks

[hiddeco]

Hey @chamodshehanka,

Information about how Kargo can be run locally can be found here: https://docs.kargo.io/contributor-guide/hacking-on-kargo#iterating-quickly

However, as we would like to have this included in 1.4.0. You can leave this with me for now, and I will do the due diligence on rebasing and testing this pull request if this is alright with you.