Add a new 'lines' text format

[jobarr-amzn]

Also adopt ion-rs 0.14.0

Description of changes:
This adds support for the new lines() formatter in ion-rs: https://github.com/amzn/ion-rust/blob/main/src/text/raw_text_writer.rs#L34-L52

This is helpful for working with line-delimited text-oriented tooling (sort, grep, uniq etc.).

Testing:
Comparing the various text formats.

❯ cat c.json | cargo -q run dump --format text

[1, 2, 3] [4, 5, 6]

❯ cat c.json | cargo -q run dump --format lines

[1, 2, 3]
[4, 5, 6]

❯ cat c.json | cargo -q run dump --format pretty

[
    1,
    2,
    3
]
[
    4,
    5,
    6
]

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[zslayton]

Thanks! Side question: do we have a unit test somewhere that guarantees that text values written by the lines writer always escape their return lines?

[jobarr-amzn]

Thanks! Side question: do we have a unit test somewhere that guarantees that text values written by the lines writer always escape their return lines?

No... I didn't think of this, so I have not looked into it.

[zslayton]

Thanks! Side question: do we have a unit test somewhere that guarantees that text values written by the lines writer always escape their return lines?

No... I didn't think of this, so I have not looked into it.

Offhand, I don't think any of the text writers emit multiline strings yet, so we're probably ok for now.