Add optional esmvalcore dependency & `to_esmvalcore` method#717

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charles-turner-1 wants to merge 19 commits intomainfrom

Commits on May 5, 2025

Add optional imports following the polars optional import method (simplified) & tests for the changes to the __init__.py
charles-turner-1
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Commits on May 6, 2025

Commits on May 9, 2025

Facets now read from esmvalcore intake configuration file instead of passed to `to_iris` call by user.
charles-turner-1
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Commits on May 12, 2025

WIP (has polars change broken require_all?)
charles-turner-1
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Search history memory on `esm_datastores`. Probably won't work in situations where `require_all_on` has been used
charles-turner-1
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Commits on May 14, 2025

rename `to_iris` => `to_esmvalcore`
charles-turner-1
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Commits on Aug 29, 2025

Merge branch 'main' into to-iris
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