Re: Add conan support

[wx257osn2]

related: #684

This PR contains below:

• Add "package" = {version = "...", registry = "conan-v1"} syntax
  • "package" = {version = "..."} and "package" = {version = "...", registry = "poac"} is same as "package" = "..."
• Add conan v1 support
  • About 10 days ago, conan v2 had been released. This PR doesn't support that.

See https://github.com/wx257osn2/poac-conan-demo for usage.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (b47c245) 98.09% compared to head (b8deb54) 98.09%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #753   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files          52       52           
  Lines        2526     2526           
=======================================
  Hits         2478     2478           
  Misses         48       48           

Impacted Files	Coverage Δ
include/poac/core/resolver/resolve.hpp	100.00% <ø> (ø)

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[ken-matsui]

@wx257osn2 Fixed the build errors caused on macOS. Please let me know when this PR gets ready.

[wx257osn2]

@ken-matsui IMO we should support conan v2, but it may be not necessarily to contains that in this PR.
How do you think? If you will decide to separate PR to support v2, this PR will be ready to review.
If not, I will research how to use v2, and implement it. It will take some time to do, but...

[ken-matsui]

@wx257osn2 You do not have to care about V2 for now. This PR should focus on V1. Thanks!

[ken-matsui]

Thank you for your time to work on this PR!