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chore: Add http_route label to HTTP server metrics (#2330)

## What kind of change does this PR introduce?

This PR adds the `http_route` label to standard HTTP server metrics
collected by the otelhttp package. This enables users to collect HTTP
metrics per route.

Because `WithMetricAttributesFn` is only available in newer versions of
otelhttp, this commit also upgrades the otelhttp package to v0.63.0. As
a result, HTTP request metrics now use the newer `http_server_request_`
naming convention rather than just `http_server_`.

## What is the current behavior?

Currently, the `http_server_duration_milliseconds_bucket` metric does
not include HTTP route labels. This means HTTP duration metrics are
heavily skewed towards fast, frequently accessed API routes such as
/user.

## What is the new behavior?

There are two changes introduced in this PR:

* The `http_server_duration_milliseconds_bucket` metric is renamed to
`http_server_request_duration_seconds_bucket`
* The `http_server_request_duration_seconds_bucket` metric has an
additional label, `http_route`, that matches the `http_route` label in
the `http_status_codes_total` metric

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