Fix issue #145 for compilation error in ESP32 Core v3.1.x

Fix chunked encoding issue

Fix chenked data decoding issue #175 introduced by PR #172

The string_t and object_t enhancement

Fix possible stack ovf issue #169 for ESP8266 due to too large printf…

… buffer.

Fix compilation error when Service Auth was disabled

Fix Raspberry Pi Pico compilation error

64 bit integer to string conversion optimization

Fix 64-bit number to string conversion in some platforms

Fix Firestore's IntegerValue class issue #164