Get method for size limitation on PR content

[attiasas]

• [x] All tests passed. If this feature is not already covered by the tests, I added new tests.
• [x] I used go fmt ./... for formatting the code before submitting the pull request.
• [x] This feature is included on all supported VCS providers - GitHub, Bitbucket cloud, Bitbucket server, GitLab and Azure Repos.
• [x] I added the relevant documentation for the new feature.

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Add new methods to get the size limitations for the pull request content (details/comments). It allows us to figure out dynamically if the content will overflow and the API will result in failures.

Limitations found:

Github

• Size limitation: 65,536 chars Limitation is not mentioned in the docs, found references at: https://github.com/orgs/community/discussions/27190

  Gitlab

• Merge Request details limit: 1,048,576 chars docs
• Merge Request comment content limit: 1,000,000 chars docs

  BitBucket

• Pull Request content limit: 32,768 chars:

  11:07:00 [Error] couldn't add pull request comment: Status: 400 Bad Request, Body: {"errors":[{"context":"text","message":"Please enter a non-empty value less than 32768 characters","exceptionName":null}]}

  Azure Repos

• Pull Request details limit: 4,000 chars Limitation is not mentioned in the docs, found references at: https://developercommunity.visualstudio.com/t/Raise-the-character-limit-for-pull-reque/365708?stateGroup=active
• Pull Request comment content limit: 150,000 chars Limitation is not mentioned in the docs, found references at: https://github.com/Azure/AzOps/issues/652

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