Functionality to upload annotations on task creation

[egrinstein]

Motivation and context

Sometimes I have some base annotations I want to add to a task when I create them (for QA, for example). Discussed with @nmanovic at #1453

How has this been tested?

I have tested this locally by uploading tasks of different sizes.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
• I have updated the documentation accordingly
• I have added tests to cover my changes
• [] I have linked related issues (read github docs)
• I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2020 Intel Corporation
#
# SPDX-License-Identifier: MIT

[azhavoro]

Thank you for the PR!
Could you please fix tests:

ERROR: test_tasks_list (tests._test_cli.TestCLI)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python3.5/unittest/mock.py", line 1157, in patched
    return func(*args, **keywargs)
  File "/home/django/utils/cli/tests/_test_cli.py", line 32, in setUp
    [self.img_file])
TypeError: tasks_create() missing 3 required positional arguments: 'annotation_path', 'annotation_format', and 'cooldown_period_in_secs'

[coveralls]

Pull Request Test Coverage Report for Build 6053

• 9 of 21 (42.86%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 65.436%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
utils/cli/core/core.py	6	18	33.33%

Totals
Change from base Build 6048:	-0.03%
Covered Lines:	10959
Relevant Lines:	16338

---

💛 - Coveralls

[azhavoro]

LGTM

[nmanovic]

@egrinstein , thanks for the contribution!

[egrinstein]

@nmanovic you welcome, thanks for all the help and the great product.