Make TCP connect timeout configurable (remove hardcoded 75s)

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Summary

When using a SSL Client over TinyGSM (eg. GovoroxSSLClient), the SSL wrapper calls client.connect(host, port) with no timeout parameter.
In TinyGSM, this path falls back to a hardcoded 75 second TCP connect timeout, which is far too long for embedded use and easily trips the Task Watchdog (TWDT) when a broker is unreachable or the network is poor.

This timeout is currently not configurable via compile-time or runtime, the base Client interface (which must work for both Wi-Fi and GSM clients) cannot pass a third “timeout” argument.

Expected behavior

• The TCP connect timeout should not be hardcoded.
• Library users should be able to customize the connect timeout:
  • at compile time via a #define
  • and at runtime via a setter on the client (so higher layers like SSL can configure it without changing call signatures).

Proposed solution

1. Add a compile-time default:

// in TinyGsmClient.h (or common config)
#ifndef TINYGSM_TCP_CONNECT_TIMEOUT_MS
#define TINYGSM_TCP_CONNECT_TIMEOUT_MS 75000
#endif 

2. Add a runtime-settable member + setter on the GsmClient class:

public:
  void setConnectTimeout(int seconds) { _connectTimeoutS = seconds; }
  int  getConnectTimeout() const { return _connectTimeoutS; }

private:
  int _connectTimeoutS = TINYGSM_DEFAULT_CONNECT_TIMEOUT_S;

3. Replace the macro with a version that uses the member (falls back to the define):

#define TINY_GSM_CLIENT_CONNECT_OVERRIDES                             \
  int connect(IPAddress ip, uint16_t port, int timeout_s) {           \
    return connect(TinyGsmStringFromIp(ip).c_str(), port, timeout_s); \
  }                                                                   \
  int connect(const char* host, uint16_t port) override {             \
    /* prefer runtime value if present, else compile-time default */  \
    return connect(host, port, _connectTimeoutS);                     \
  }                                                                   \
  int connect(IPAddress ip, uint16_t port) override {                 \
    return connect(ip, port, _connectTimeoutS);                       \
  }

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