Reana-server

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- Adds support for listing files using glob patterns.
- Adds support for glob patterns and directory downloads, packaging the content into a zip file.

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- Adds configuration to set a timeout between ``reana_ready`` checks. (``REANA_SCHEDULER_SECONDS_TO_WAIT_FOR_REANA_READY``)
- Fixes start workflow endpoint to work with unspecified ``operational_options`` parameter
- Fixes workflow scheduling bug in which failed worfklows would count as running, reaching ``REANA_MAX_CONCURRENT_BATCH_WORKFLOWS`` and therefore, blocking the ``job-submission`` queue.

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- Adds optional email confirmation step after users sign up.
- Changes email notifications with enriched instructions on how to grant user tokens.

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- Changes rate limiting defaults to allow up to 20 connections per second.
- Fixes minor code warnings.

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- Fixes REANA <-> GitLab synchronisation for projects having additional external webhooks.
- Fixes restarting of Yadage and CWL workflows.
- Fixes conflicting ``kombu`` installation requirements by requiring Celery version 4.
- Changes ``/api/you`` endpoint to include REANA server version information.

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- Adds new endpoint to request user tokens.
- Adds email notifications on relevant events such as user token granted/revoked.
- Adds new templating system for notification email bodies.
- Adds possibility to query logs for a single workflow step.
- Adds endpoint to retrieve the workflow specification used for the workflow run.
- Adds preview flag to download file endpoint.
- Adds validation of submitted operational options before starting a workflow.
- Adds possibility to upload empty files.
- Adds new block size option to specify the type of units to use for disk size.
- Adds a possibility to upload new workflow definitions before restarting a workflow.
- Adds new command to generate status report for the REANA administrators; useful as a cronjob.
- Adds user token management commands to grant and revoke user tokens.
- Adds support for local user management.
- Adds pinning of all Python dependencies allowing to easily rebuild component images at later times.
- Fixes bug related to rescheduling deleted workflows.
- Changes ``REANA_URL`` configuration variable to more precise ``REANA_HOSTNAME``.
- Changes workflow list endpoint response payload to include workflow progress information.
- Changes import/export commands with respect to new user model fields.
- Changes submodule installation in editable mode for live code updates for developers.
- Changes pre-requisites to Invenio-Accounts 1.3.0 to support REST API.
- Changes ``/api/me`` to ``/api/you`` endpoint due to conflict with Invenio-Accounts.
- Changes base image to use Python 3.8.
- Changes code formatting to respect ``black`` coding style.
- Changes documentation to single-page layout.