Add http_method tag to micrometer metrics

[rnavarropiris]

Add HTTP method information as tag for micrometer HTTP requests.

[rnavarropiris]

Addresses: #1631

[velo]

I'm happy with the change, we just need to have CI happy too

[rnavarropiris]

Thanks @velo!
I did see some syntax related error reported. I imported the eclipse settings into IntelliJ and reformatted the reported file, but the error persist.

Since I'm not sure what else could be wrong and I didn't see any troubleshooting notes ( I checked README, CONTRIBUTING & HACKING), could you lend me a hand/give me a hint? :)

[velo]

Did you build the project locally?

[rnavarropiris]

@velo
I tried (mvn package), but stumble against this error:

[ERROR] No plugin found for prefix 'feign-example-github' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/Users/.../.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException: No plugin found for prefix 'feign-example-github' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/Users/.../.m2/repository), central (https://repo.maven.apache.org/maven2)]

Seems to happen when executing the task :feign-example-github :/