[chore] Add axw to awsfirehosereceiver codeowners

[axw]

Description

I would like to become a codeowner of the awsfirehosereceiver. Elastic (where I work) intends to use this receiver heavily, and I would like to:

• help spread out the maintenance load
• ensure we have a path to progressing beyond the current Alpha stability

Assuming open-telemetry/opentelemetry-collector#11864 goes through, it will be necessary to have multiple codeowners to progress to Beta and preferable to have codeowners from multiple employers, which is the case for @Aneurysm9 (AWS) and me (Elastic).

Relevant changes:

• receiver/awsfirehosereceiver: optimise cwlogs unmarshaler #37111 (superseded by [receiver/awsfirehose] Refactor to use pdata unmarshaler interfaces #37361)
• [receiver/awsfirehose] Add support for encoding extensions #37262
• [receiver/awsfirehose] Refactor to use pdata unmarshaler interfaces #37361
• Create extension/encoding/awscloudwatchmetricstreamsencoding #38388 (will extract from awsfirehosereceiver)
• awsfirehosereceiver: ignore CONTROL_MESSAGE log records #38445

Link to tracking issue

N/A

Testing

N/A

Documentation

N/A

[atoulme]

@Aneurysm9 gentle bump to ask you to review this change. Thanks!