ebourg / jsign / #389

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master: 81%

Pull #342

Implement HTTP retry logic and set connection timeout in RESTClient

- Implemented retry logic in `RESTClient` for `SocketTimeoutException`: up to 3 attempts with a 5-second pause between attempts.
- Set the default connection timeout to 30 seconds.
- Refactored `RESTClient.query` into `query` (retry loop) and `queryOnce` (single request logic).
- Added `openConnection(URL)` and `sleep(long)` methods to `RESTClient` to facilitate testing.
- Added `net.jsign.jca.RESTClientTest` to verify the retry logic and timeout.

Co-authored-by: ebourg <54304+ebourg@users.noreply.github.com>

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