collect HTTP client metrics

[lucix-aws]

Emit HTTP-related metrics as part of service client operations.

This is the proposed list of values to track, though net/http/httptrace may limit what we can do in this SDK:

Metric Name	Unit	Type	Description	Attributes (Dimensions)
client.http.connections.acquire_duration	s	Histogram	The time it takes a request to acquire a connection
client.http.connections.limit	{connection}	UpDownCounter	The maximum open connections allowed/configured for the HTTP client
client.http.connections.usage	{connection}	UpDownCounter	Current state of connections pool	state: idle / acquired
client.http.connections.uptime	s	Histogram	The amount of time a connection has been open
client.http.requests.usage	{request}	UpDownCounter	The current state of HTTP client request concurrency	state: queued / in-flight
client.http.requests.queued_duration	s	Histogram	The amount of time a request spent queued waiting to be executed by the HTTP client
client.http.bytes_sent	By	MonotonicCounter	The total number of bytes sent by the HTTP client	server.address
client.http.bytes_received	By	MonotonicCounter	The total number of bytes received by the HTTP client	server.address

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