Copyright headers.

[DomInvivo]

Changelogs

• Adding Copyright headers in every .py file
• Adding Copyright headers in every .sh file
• Adding mention of more collaborators in LICENSE file

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Checklist:

• [x] Was this PR discussed in an issue? Closes issue #486

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This PR is simply to add a Copyright notice everywhere, and update the LICENSE file. There's a lot of changes but it's quite simple. I'm tagging lots of reviewers for visibility.

About 90-95% of the file headers are:

"""
--------------------------------------------------------------------------------
Copyright (c) 2023 Valence Labs, Recursion Pharmaceuticals and Graphcore Limited.

Use of this software is subject to the terms and conditions outlined in the LICENSE file.
Unauthorized modification, distribution, or use is prohibited. Provided 'as is' without
warranties of any kind.

Valence Labs, Recursion Pharmaceuticals and Graphcore Limited are not liable
for any damages arising from its use. Refer to the LICENSE file for the full terms and conditions.
--------------------------------------------------------------------------------
"""

With 2 .sh files modified to attribute only to Graphcore and ~10 .py files modified to attribute only to Valence. To be safe, every file that was modified between 5 and 18 months ago were attributed to everyone.

I also listed the most important Academic collaborators in the LICENSE file

[codecov[bot]]

Codecov Report

Merging #495 (2829821) into main (8cbf2d0) will increase coverage by 0.18%. Report is 10 commits behind head on main. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #495 +/- ## ========================================== + Coverage 71.35% 71.54% +0.18% ========================================== Files 94 93 -1 Lines 8718 8702 -16 ========================================== + Hits 6221 6226 +5 + Misses 2497 2476 -21 ``` | [Flag](https://app.codecov.io/gh/datamol-io/graphium/pull/495/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datamol-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/datamol-io/graphium/pull/495/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datamol-io) | `71.54% <ø> (+0.18%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datamol-io#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/datamol-io/graphium/pull/495/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datamol-io) | Coverage Δ | | |---|---|---| | [ipu](https://app.codecov.io/gh/datamol-io/graphium/pull/495/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=datamol-io) | `49.14% <ø> (ø)` | |