[Profiler] Utilize symfony/var-dumper for dumping response body

[ostrolucky]

Q	A
Bug fix?	no
New feature?	yes
BC breaks?	no
Deprecations?	no
Related tickets	finishes #245
Documentation
License	MIT

What's in this PR?

Similarly like symfony/http-client and other bundles, this utilizes symfony/var-dumper to format request/response body messages.

Json detection was partially taken over from csa/guzzle-bundle

This results in much improved design of body formatting, replacing plain nl2br that was used till now.

Checklist

• Updated CHANGELOG.md to describe BC breaks / deprecations | new feature | bugfix
• CI https://app.travis-ci.com/github/ostrolucky/HttplugBundle/builds/236415878
• Documentation pull request created (if not simply a bugfix)

[dbu]

very nice, thanks!

[dbu]

thanks!

do you plan to work on fixing the ci setup of the bundle? (i guess we should port it to github actions like we did for other php-http repositories...) while this looks good to me, i'd prefer to see the CI running through before merging ;-)

[ostrolucky]

CI is running, see https://app.travis-ci.com/github/ostrolucky/HttplugBundle/builds. But yes, I plan to move it to GH actions.

[dbu]

oh, github showed travis-ci as outstanding. looks good then, i merged the change.

i let you decide when to tag a release ;-)