Indented multiline cell content doesn't retain indentation

## Disclaimer

I could always be making a mistake on my end...failing to set an option, etc.

## Problem Statement

I prefer your table lib over other very good libs, however there's an issue with rendering indented, multiline content, such as when I display two formatted json structures side-by-side for comparison. It appears the content may be getting trimmed line-by-line? (I haven't looked at your code.)

Here's a link to a play comparing outputs between this (preferred) lib, and another (excellent, and currently in use) table lib: https://go.dev/play/p/_Cy7gLBIxja

## Want: Retains nice indentation

```
+-----------------------------+-----------------------+
| JSON A | JSON B |
+-----------------------------+-----------------------+
| { | { |
| "foo": "fooA", | "foo": "fooB", |
| "bars": [ | "bars": [ |
| { | { |
| "name": "bar1", | "name": "bar1", |
| "a_num": 73, | "baz": false |
| "is_something": false | }, |
| }, | { |
| { | "name": "bar2", |
| "name": "bar2", | "baz": true |
| "a_num": 2, | } |
| "is_something": true | ] |
| } | } |
| ] | |
| } | |
+-----------------------------+-----------------------+
```

## Got:

```
┌───────────────────────┬─────────────────┐
│ JSON A │ JSON B │
├───────────────────────┼─────────────────┤
│ { │ { │
│ "foo": "fooA", │ "foo": "fooB", │
│ "bars": [ │ "bars": [ │
│ { │ { │
│ "name": "bar1", │ "name": "bar1", │
│ "a_num": 73, │ "baz": false │
│ "is_something": false │ }, │
│ }, │ { │
│ { │ "name": "bar2", │
│ "name": "bar2", │ "baz": true │
│ "a_num": 2, │ } │
│ "is_something": true │ ] │
│ } │ } │
│ ] │ │
│ } │ │
└───────────────────────┴─────────────────┘
```

## Usual Sob Story

I'd love to contribute a fix for this, however this unfortunately relates to a work effort. Because my employer avoids ip ownership and licensing conflicts by not allowing open source contributions, I cannot.

Start by reproducing the linked Go playground example with the indented, multiline JSON cells and compare the rendered output. Trace the table's multiline cell rendering to find where leading whitespace is removed. Done means indentation is preserved in multiline cells and the reported comparison output renders as shown.

Written by the indexing model from the issue text.