No way to set `SSL_OP_IGNORE_UNEXPECTED_EOF` for ::HTTPClient, but Google services don't send `close_notify`

### Summary
- We want to set `SSL_OP_IGNORE_UNEXPECTED_EOF` to deal with Google server TLS implementation
- `::HTTPClient` provides no way to do that, not even through global settings
- Monkeypatching `BaseService#new_client` seems like the only path forward

### Background
My company—using Openssl 3—is seeing frequent SSL errors while using this library to interact with Google services that look like `SSL_read: unexpected eof while reading`. Specific services we've seen this from in the last few days are Bigquery and Storage.

We noticed that the public HTTPS load balancer service (https://cloud.google.com/load-balancing/docs/https) is documented to not send a `close_notify`, so we feel like it's pretty likely that at least some Google APIs also don't do this, and that's why we're observing this behavior.

HTTP clients can protect against truncation attacks using Content-Length header, so we're comfortable using the `SSL_OP_IGNORE_UNEXPECTED_EOF` option to ignore these unexpected EOFs for Google services.

### Problem
However, there is no way we can see to actually set this option on the SSL sockets created by this library. It uses `::HTTPClient`, which sets some default SSL options (https://github.com/nahi/httpclient/blob/master/lib/httpclient.rb#L446 --> https://github.com/nahi/httpclient/blob/master/lib/httpclient/ssl_config.rb#L162).

Ideally we'd be able to set `SSL_OP_IGNORE_UNEXPECTED_EOF` specifically when making requests to Google APIs, but even if we were comfortable always having it set, we still can't: `::HTTPClient` doesn't check `OpenSSL::SSL::SSLContext::DEFAULT_PARAMS` or provide some other way to set SSL options globally.

### Proposed fix

Give users of the library a way to further customize the SSL options used by `::HTTPClient` instance used by `BaseService`. Some potential ideas:
- most direct: add a nilable `ssl_options` Integer to `Google::Apis::ClientOptions`, and in `BaseServer#new_client` check if its set and use it if so
- use faraday: https://github.com/googleapis/google-api-ruby-client/issues/2348 and add a hook to inject custom faraday middleware

### Our workaround

In the meantime, we're probably going to monkeypatch `BaseService#new_client` to edit the SSL configuration. This will be brittle to library changes and hard to test (as we end up mocking out google services at higher level in most of our tests). We'd love any other ideas / or if there's some other way we're missing to set this option!

Beginne damit, die HTTPClient-SSL-Einrichtung in lib/httpclient.rb und lib/httpclient/ssl_config.rb zu lesen, und verfolge dann BaseService#new_client und Google::Apis::ClientOptions. Vergleiche das vorgeschlagene Feld ssl_options mit dem alternativen Faraday-Hook. Als abgeschlossen gilt die Aufgabe, wenn Aufrufer die SSL-Optionen für den BaseService HTTPClient anpassen können, einschließlich SSL_OP_IGNORE_UNEXPECTED_EOF für Google API-Anfragen.

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