Manifest-tool

- Add `manifest-package-tool`:
- New tool to generate combined package files for combined updates.
- Update the `README.md` file.

- Add encrypted payload support to `manifest-tool`:
- Add `encrypted-raw` payload format and encrypted payload information to manifest configuration file.
- Add encrypted payload support to `manifest-dev-tool`:
- Add `--encrypted-digest` and `--encrypted-size` options to `create` command.
- Add `--encrypt-payload` option to `update`.
- Build wheels for `manylinux_2_24_x86_64`.
- Improve the tool help and the `README.md` file.

- Changes to `manifest-dev-tool`:
- Improve timeout and connection error handling.
- Add skipped and failed reasons to campaign summary.
- Add `--key` and `--update-certificate` options to `init` command to initialize the development environment with existing credentials.
- Add `--fw-migrate-ver` option to v1 commands. This lets you set a semantic version for the firmware when upgrading from Device Management Client 4.7.1 and lower to Device Management Client 4.8.0 and higher, which supports manifest schema v3.
- Improve manifest configuration file validation.
- Use `access_key` in configuration files but continue to accept `api_key` for backward compatibility.
- Set minimum SemVer value to `0.0.1`.
- Improve the tool help and the `README.md` file.
- Update license and copyrights information.

- Remove support for Python 3.5.
- In v1 schema, allow creating manifests without the `priority` field.
- Changes to the `manifest-dev-tool`:
- Fix usage of https://api.us-east-1.mbedcloud.com as default Pelion Device Management API URL.
- Changes to the `manifest-dev-tool update` command:
- Add `--use-short-url` option. Using this option decreases manifest size.
**Note:** The device must be configured to use CoAP.
- Add `--gw-preset` option, which enables presetting an access key in a `.pelion-dev-presets.yaml` file in the home directory.
- Print campaign summary on tool exit.
- Upload firmware images smaller than 100MB with the `/v3/firmware-images` API.
- Improve the tool help and the `README.md`.

- Stop using deprecated `mbed-cloud-sdk` package
- Introduce support for `upload-jobs` for uploading FW image - allow
uploading files bigger than 100MB
- Assert campaign is started when calling `manifest-dev-tool update
--wait-for-completion`
- Assert all devices targeted by the update campaign were successfully
updated when calling `manifest-dev-tool update --wait-for-completion`
- Add an option to specify custom vendor and class IDs to
`manifest-dev-tool init` command. Check the `--help` for details
- Fixed `manifest-tool parse` output formatting - improves readability
- Deprecate `-f/--force` flags in `manifest-dev-tool init`. The default
behavior will always reinitialize the environment. The flag is still
supported but has no effect and deprecation warning message will be
emitted.

Works with client-lite.

Key differences from previous version: