Metadata autogenerate creates invalid name when metrics attributes has a period

[JonathanWamsley]

Describe the bug
Unable to successfully autogenerate valid metadata using the //go:generate mdatagen --experimental-gen metadata.yaml tag in a codegen.go file. An invalid string name is created when a metrics attributes has a period within it (i.e. attributes: [ http.method ]) in the metadata.yaml file.

Steps to reproduce
Add a metric with an attribute with a period in a metadata.yaml file. Include a codegen.go file with the //go:generate mdatagen --experimental-gen metadata.yaml tag. Run make generate

What did you expect to see?
No error.

What did you see instead?
An error

Which led me to examine the generated file.

A generated function with an invalid string name http.methodAttributeValue string

What version did you use?
Version: v0.41.0

What config did you use?
Config: metadata.yaml

Environment
MacOS

[JonathanWamsley]

@dmitryax I noticed this while responding to your comment on my pr #6878 (review)

[dmitryax]

Hi @JonathanWamsley, thank for reporting. Nice catch! Let me fix the builder