Similar to nushell#9979

`random decimal` will now raise a warning and can be removed in an
upcoming release.

New command is named `random float`

Tests updated and improved.

# Description
Similar to #9979

# User-Facing Changes
`random decimal` will now raise a warning and can be removed in an
upcoming release.

New command is named `random float`

# Tests + Formatting
Tests updated and improved.

# Description
We made the decision that our floating point type should be referred to
as `float` over `decimal`.
Commands were updated by #9979 and #10320

Now make the internal codebase consistent in referring to this data type
as `float`.

Work for #10332

# User-Facing Changes

`decimal` has been removed as a type name/symbol. 

Instead of 
```nushell
def foo [bar: decimal] decimal -> decimal {}
```
use 
```nushell
def foo [bar: float] float -> float {}
```

Potential effect of `SyntaxShape`'s `Display` implementation now also
referring to `float` instead of `decimal`

# Details
- Rename `SyntaxShape::Decimal` to `Float`
- Update `Display for SyntaxShape` to `float`
- Update error message + fn name in dataframe code
- Fix docs in command examples
- Rename tests that are float specific
- Update doccomment on `SyntaxShape`
- Update comment in script

# Tests + Formatting
Updates the names of some tests

followup to
- #9979

## ⚠️ wait for just before 0.86 ⚠️

# Description
after deprecation comes removal 😏 

# User-Facing Changes
`into decimal` is removed in favor of `into float`

# Tests + Formatting

# After Submitting

followup to
- #9979

## ⚠️ wait for just before 0.86 ⚠️

# Description
after deprecation comes removal 😏 

# User-Facing Changes
`into decimal` is removed in favor of `into float`

# Tests + Formatting

# After Submitting

# Description
We keep "into decimal" for a release and warn through a message that it
will be removed in 0.86.

All tests are updated to use `into float`

# User-Facing Changes
`into decimal` raises a deprecation warning, will be removed soon.
Use `into float` as the new functionally identical command instead.

```
~/nushell> 2 | into decimal
Error:   × Deprecated command
   ╭─[entry #1:1:1]
 1 │ 2 | into decimal
   ·     ──────┬─────
   ·           ╰── `into decimal` is deprecated and will be removed in 0.86.
   ╰────
  help: Use `into float` instead


2
```

# Tests + Formatting
Updated

---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

# Description
Similar to nushell#9979

# User-Facing Changes
`random decimal` will now raise a warning and can be removed in an
upcoming release.

New command is named `random float`

# Tests + Formatting
Tests updated and improved.

# Description
We made the decision that our floating point type should be referred to
as `float` over `decimal`.
Commands were updated by nushell#9979 and nushell#10320

Now make the internal codebase consistent in referring to this data type
as `float`.

Work for nushell#10332

# User-Facing Changes

`decimal` has been removed as a type name/symbol. 

Instead of 
```nushell
def foo [bar: decimal] decimal -> decimal {}
```
use 
```nushell
def foo [bar: float] float -> float {}
```

Potential effect of `SyntaxShape`'s `Display` implementation now also
referring to `float` instead of `decimal`

# Details
- Rename `SyntaxShape::Decimal` to `Float`
- Update `Display for SyntaxShape` to `float`
- Update error message + fn name in dataframe code
- Fix docs in command examples
- Rename tests that are float specific
- Update doccomment on `SyntaxShape`
- Update comment in script

# Tests + Formatting
Updates the names of some tests

followup to
- nushell#9979

## ⚠️ wait for just before 0.86 ⚠️

# Description
after deprecation comes removal 😏 

# User-Facing Changes
`into decimal` is removed in favor of `into float`

# Tests + Formatting

# After Submitting

followup to
- nushell#9979

## ⚠️ wait for just before 0.86 ⚠️

# Description
after deprecation comes removal 😏 

# User-Facing Changes
`into decimal` is removed in favor of `into float`

# Tests + Formatting

# After Submitting