zc he 6e88b3f8d6
refactor(completion): expression based variable/cell_path completion (#15033)
# Description

fixes #14643 , as well as some nested cell path cases:

```nushell
let foo = {a: [1 {a: 1}]}

$foo.a.1.#<tab>

const bar = {a: 1, b: 2}
$bar.#<tab>
```

So my plan of the refactoring process is that:
1. gradually move those rules of flattened shapes into expression match
branches, until they are gone
2. keep each PR focused, easier to review and track. 

# User-Facing Changes

# Tests + Formatting

+2

# After Submitting
2025-02-09 22:26:41 -05:00
..
2025-02-09 11:21:56 -05:00
2025-02-05 00:19:48 -05:00
2022-02-07 14:54:06 -05:00

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These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.

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Plugins are likewise also split into two types:

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