mgs: add version 0.2.1, support conan v2

[toge]

Specify library name and version: mgs/*

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (091e15087f5f54f60c9b6be9d85ad57affd177c5):

• mgs/0.2.1@:
  All packages built successfully! (All logs)

• mgs/0.2.0@:
  All packages built successfully! (All logs)

• mgs/0.1.5@:
  All packages built successfully! (All logs)

• mgs/0.1.4@:
  All packages built successfully! (All logs)

• mgs/0.1.2@:
  All packages built successfully! (All logs)

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Conan v2 pipeline (informative, not required for merge) ❌

Note: Conan v2 builds are informative and they are not required for the PR to be merged.

The v2 pipeline failed. Please, review the errors and note this will be required for pull requests to be merged in the near future.

See details:

Failure in build 2 (091e15087f5f54f60c9b6be9d85ad57affd177c5):

• mgs/0.1.2@:
  Didn't run or was cancelled before finishing

• mgs/0.1.5@:
  Didn't run or was cancelled before finishing

• mgs/0.2.1@:
  CI failed to create some packages (All logs)

  Logs for packageID da39a3ee5e6b4b0d3255bfef95601890afd80709:

  [settings]
  arch=x86_64
  build_type=Release
  compiler=gcc
  compiler.libcxx=libstdc++11
  compiler.version=11
  os=Linux
  

  [...]
  compiler.libcxx=libstdc++11
  compiler.version=11
  os=Linux
  [conf]
  tools.system.package_manager:mode=install
  tools.system.package_manager:sudo=True
  
  Profile build:
  [settings]
  arch=x86_64
  build_type=Release
  compiler=gcc
  compiler.libcxx=libstdc++11
  compiler.version=11
  os=Linux
  [conf]
  tools.system.package_manager:mode=install
  tools.system.package_manager:sudo=True
  
  
  -------- Computing dependency graph --------
  Graph root
      virtual
  Requirements
      mgs/0.2.1#f5b7c5411d95a6a65c453e8f5171fd9e - Cache
  
  -------- Computing necessary packages --------
  mgs/0.2.1: Forced build from source
  Requirements
      mgs/0.2.1#f5b7c5411d95a6a65c453e8f5171fd9e:da39a3ee5e6b4b0d3255bfef95601890afd80709 - Build
  
  -------- Installing packages --------
  
  -------- Installing (downloading, building) binaries... --------
  mgs/0.2.1: Calling source() in /home/conan/w/prod-v2/BuildSingleReference/p/9db4d9a9c25bd847/s/src
  Downloading mgs.zip
  
  mgs/0.2.1: Unzipping 300.4KB, this can take a while
  
  mgs/0.2.1: Building your package in /home/conan/w/prod-v2/BuildSingleReference/p/tmp/c3d079b86dc7d437/b
  mgs/0.2.1: Aggregating env generators
  mgs/0.2.1: Package 'da39a3ee5e6b4b0d3255bfef95601890afd80709' built
  mgs/0.2.1: Build folder /home/conan/w/prod-v2/BuildSingleReference/p/tmp/c3d079b86dc7d437/b/build-release
  mgs/0.2.1: Generated conaninfo.txt
  mgs/0.2.1: Generating the package
  mgs/0.2.1: Temporary package folder /home/conan/w/prod-v2/BuildSingleReference/p/tmp/c3d079b86dc7d437/p
  mgs/0.2.1: Calling package()
  ERROR: mgs/0.2.1: Error in package() method, line 55
  	self.copy("*", src=os.path.join(self.source_folder, "include"), dst=os.path.join(self.package_folder, "include"))
  	AttributeError: 'MgsConan' object has no attribute 'copy'
  

• mgs/0.2.0@:
  Didn't run or was cancelled before finishing

• mgs/0.1.4@:
  Didn't run or was cancelled before finishing

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^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}

[uilianries]

LGTM