fix(android): harden HTTPClient — DNS error code, retry, timeoutForResource, progress throttle

[mbender74]

Hardens Ti.Network.HTTPClient:

• Reports a clear error code on DNS/connection failure.
• Resets requestPending on IOException so retries actually fire instead of being skipped because the flag stayed set.
• Adds timeoutForResource support and the corresponding TiC constant.
• Throttles progress callbacks to avoid flooding the JS bridge, and cleans up spill temp files.
• Default timeout and network constants in TiC.