Bahex 3182adb6a0
Url split query (#14211)
Addresses the following points from #14162

> - There is no built-in counterpart to url build-query for splitting a
query string

There is `from url`, which, due to naming, is a little hard to discover
and suffers from the following point

> - url parse can create records with duplicate keys
> - url parse's params should either:
>   - ~group the same keys into a list.~
> - instead of a record, be a key-value table. (table<key: string,
value: string>)

# Description

## `url split-query`

Counterpart to `url build-query`, splits a url encoded query string to
key value pairs, represented as `table<key: string, value: string>`

```
> "a=one&a=two&b=three" | url split-query
╭───┬─────┬───────╮
│ # │ key │ value │
├───┼─────┼───────┤
│ 0 │ a   │ one   │
│ 1 │ a   │ two   │
│ 2 │ b   │ three │
╰───┴─────┴───────╯
```

## `url parse`

The output's `param` field is now a table as well, mirroring the new
`url split-query`

```
> 'http://localhost?a=one&a=two&b=three' | url parse
╭──────────┬─────────────────────╮
│ scheme   │ http                │
│ username │                     │
│ password │                     │
│ host     │ localhost           │
│ port     │                     │
│ path     │ /                   │
│ query    │ a=one&a=two&b=three │
│ fragment │                     │
│          │ ╭───┬─────┬───────╮ │
│ params   │ │ # │ key │ value │ │
│          │ ├───┼─────┼───────┤ │
│          │ │ 0 │ a   │ one   │ │
│          │ │ 1 │ a   │ two   │ │
│          │ │ 2 │ b   │ three │ │
│          │ ╰───┴─────┴───────╯ │
╰──────────┴─────────────────────╯
```

# User-Facing Changes

- `url parse`'s output has the mentioned change, which is backwards
incompatible.
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Nushell core libraries and plugins

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

Foundational libraries are split into two kinds of crates:

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