first approach of HttpClient5 migration

[joanvr]

What's changed?

Added a first approach of Apache Http Client 5 migration. Right now it adds the new dependency coordinates and performs all the obvious mappings between compatible classes changing the namespace.
Some attempts on some Deprecated classes have been done, but probably with some breaking changes right now. Will need more iteration.

What's your motivation?

Spring boot 3 migration requires HttpClient upgrade.
Issue: #300

Anyone you would like to review specifically?

@timtebeek

[joanvr]

I'm using this document as a support to map 4->5 classes and track deprecations and errors:
https://docs.google.com/spreadsheets/d/1jFKxcDL-kCab_6-bDBweoimLZhKbu755ugxg5A6SJ0E/edit?usp=sharing

[timtebeek]

I'd say a good start; maybe good to complement with just the basics of a unit test before we merge, but otherwise we're mostly testing existing recipes and how they work when combined.

[timtebeek]

Great start & thanks for adding the test!

[timtebeek]

Is the top one still available? Maybe best not to replace just yet in that case.

[timtebeek]

Because if we replace this early, then we might not be able to better target a replacement that introduces try-with-resources later.

[joanvr]

nope, it's not available anymore... But I'm thinking on not just facing this "deprecated" issues yet, because in general is not as simple as just changing the type, since usually they don't have the same methods available...