[AppConfig] Configure max line width for YAML parser to stop wrapping output

[avanigupta]

Description

Fix #491
PyYAML parser has a default width of 80 characters per line for output dumping. In order to output long string values in the same line without wrapping, we need to set the width option to an arbitrarily high number in yaml.safe_dump() call.

Testing Guide

1. Create a key in AppConfig with a very long string value like ""a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a"

2. Export key-values to a YAML file:
   az appconfig kv export --format yaml -d file --path export.yaml -n test-appconfig-00

The output in file will contain wrapped value like this:

LongValue: a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
  a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change.
[Component Name 2] az command b: Add some customer-facing feature.

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[avanigupta]

cc @shenmuxiaosen

[qwordy]

/azp run

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