Add enough logging for troubleshooting

Problem/Motivation

Tested provider and faced with unexpected behavior. Didn't find any errors in other messages in log with reason why it doesn't work.

Proposed resolution

Provider should generate logs for every its step. It's FEAT #6 pf requirements. Below possible example

• Job is sent to Smartling
  • [DEBUG] Uploading job to Smartling. Id = '7', locale = 'zh-CN'
  • [INFO] Job was uploaded to Smartling. Id = '7', locale = 'zh-CN'
• Job status is updated
  • [DEBUG] Smartling gets translation progress for job id = '1', locale = 'ru-RU'. API response: approvedString = '9', completedString = '9', progress = '100'
• Translated job is downloaded
  • [INFO] Smartling downloaded the translated job id = '1', locale = 'ru-RU'
• Upload error
  • [ERROR] Smartling failed to upload job
    Project Id = '1295c174d'
    Action = 'upload'
    fileURI = 'JobID6_en_fr-ca.xlf'
    Error = 'response code -> VALIDATION_ERROR and message -> Invalid locale: ru'
    Upload params = 'Array ( [fileType] => xml [fileUri] => JobID6_en_fr-ca.xlf [callbackUrl] => [approved] => 0 [overwriteApprovedLocales] => 0 [localesToApprove[0]] => ru )'
• Get status error
  • [ERORR] Smartling tried to check file progress
    Project Id = '1295c174d'
    Action = 'get progress'
    fileURI = 'JobID6_en_fr-ca.xlf'
    Locale = 'ru'
    Error = 'response code -> VALIDATION_ERROR and message -> The locale ru could not be found for project'
• Context is created
  • [INFO] Uploaded context for job item type = 'node', id = '1'