op-service/client: Add http header option to BasicHTTPClient

[sebastianst]

Description

Adds an http header option to the BasicHTTPClient constructor. If set, this header will be added to all http requests.

Tests

Added tests of the optional http header parameter and of the header merging code itself.

Additional context

In a followup, I will add a config parameter to op-node to add an optional http header to its Beacon client. This is helpful in API endpoint authentication scenarios where we cannot use http query parameters for authentication, as these might be forwarded to the Beacon endpoint and cause errors.

Metadata

Part 1 of https://github.com/ethereum-optimism/client-pod/issues/600

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Commits

Files that changed from the base of the PR and between a69fa9a and db12150.

Walkthrough

The recent update enhances the BasicHTTPClient by introducing an optional header field for requests and optimizing header handling. A new test file http_test.go verifies the functionality of the HTTP client and header management.

Changes

File(s)	Change Summary
.../client/http.go	Updated BasicHTTPClient with optional header field. Refactored Get method for efficient header handling. NewBasicHTTPClient now supports additional client configuration options.
.../client/http_test.go	Added tests for basic HTTP client operations and HTTP header manipulation.

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[protolambda]

Changes look good, but one blocker on option pattern.