Request support for app password authentication for bitbucket

[lephuongbg]

Currently, generating Bitbucket access token for whole workspace is only available on Premium plan. People without Premium plan can only generate access token per repository. Would be great if qodo merge can support basic auth using app password as that is fairly straightforward to implement. For e.g:

auth = HTTPBasicAuth(
    get_settings().get("BITBUCKET.USERNAME", None),
    get_settings().get("BITBUCKET.APP_PASSWORD", None)
)
s = requests.Session(auth=auth)

[mrT23]

you are welcome to open a PR to add support for this method