feat(ci): cache

[JaeAeich]

cache invalidation in github actions:

• use composite actions to reduce redundancy
• cache pipx installations
• cache poetry installation

fixes - #174

PS: Roughly 50% reduction in time :) on tests, lint etc. Edit: upto ~67%.

[JaeAeich]

PS: not completed and not converting to draft because need to test CI :)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.21%. Comparing base (0b81865) to head (7a4cb0b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #178 +/- ## ======================================= Coverage 98.21% 98.21% ======================================= Files 8 8 Lines 559 559 ======================================= Hits 549 549 Misses 10 10 ``` | [Flag](https://app.codecov.io/gh/elixir-cloud-aai/TESK/pull/178/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-cloud-aai) | Coverage Δ | | |---|---|---| | [test_unit](https://app.codecov.io/gh/elixir-cloud-aai/TESK/pull/178/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-cloud-aai) | `98.21% <ø> (ø)` | | 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=elixir-cloud-aai#carryforward-flags-in-the-pull-request-comment) to find out more.

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[uniqueg]

PS: not completed and not converting to draft because need to test CI :)

Alright :) Just tag me when it's ready for review