Add decomposition module and PCA-interface

[mrfh92]

see #1455

Due Diligence

• General:
  • [ ] title of the PR is suitable to appear in the Release Notes
• Implementation:
  • [ ] unit tests: all split configurations tested
  • [ ] unit tests: multiple dtypes tested
  • [ ] documentation updated where needed

Description

Issue/s resolved: #

Changes proposed:

-

-

Type of change

Memory requirements

Performance

Does this change modify the behaviour of other functions? If so, which?

yes / no

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Codecov Report

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

Project coverage is 92.00%. Comparing base (1663a53) to head (7259c6a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1502 +/- ## ========================================== + Coverage 91.91% 92.00% +0.08% ========================================== Files 81 83 +2 Lines 11977 12072 +95 ========================================== + Hits 11009 11107 +98 + Misses 968 965 -3 ``` | [Flag](https://app.codecov.io/gh/helmholtz-analytics/heat/pull/1502/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=helmholtz-analytics) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/helmholtz-analytics/heat/pull/1502/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=helmholtz-analytics) | `92.00% <100.00%> (+0.08%)` | :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=helmholtz-analytics#carryforward-flags-in-the-pull-request-comment) to find out more.

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[mrfh92]

@mtar @ClaudiaComito thx for reviewing. I have incorporated your suggestions.

[mtar]

@mrfh92 One single line is is missing coverage.

[mrfh92]

@mtar now it should be covered

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[mrfh92]

@mtar @ClaudiaComito thx for reviewing :+1: (btw: this is milestone 2.1 of ESAPCA)