Remove unreachable branches from the binary writer (#5583)

Coverage reported conditions in the binary writer that can never be
false, and marked the code behind them with LCOV_EXCL. Remove them
instead of excluding them:

- CBOR writes the length of a string, binary value, array, or object
  exactly like an unsigned integer, only with another major type. One
  function, write_cbor_head(), now writes both, so the integer tests
  cover every width and the four excluded 64-bit length branches are
  gone.
- A last `else if` whose condition holds for every remaining value
  (an unsigned value at most UINT64_MAX, a signed one in the range of
  int64_t) is now a plain `else`.
- Whether a signed integer fits into an int64 for UBJSON and BJData is
  decided by its type at compile time. Only an integer type wider than
  64 bits gets a range check and the high-precision fallback.
- The private get_impl(boolean_t*) was never called.

The UBJSON type prefix 'H' of an optimized container of unsigned
integers beyond the range of int64 was reachable although excluded; it
is tested now.

The output is unchanged.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

tests/src/unit-ubjson.cpp

@@ -2981,3 +2981,18 @@ TEST_CASE("UBJSON roundtrips" * doctest::skip())
         }
     }
 }
+
+TEST_CASE("UBJSON optimized array of unsigned integers beyond int64")
+{
+    // UBJSON has no unsigned 64-bit type, so such values are written as
+    // high-precision numbers - also as the type of an optimized container
+    const json j = {18446744073709551615ULL, 9223372036854775808ULL};
+    const std::vector<std::uint8_t> expected =
+    {
+        '[', '$', 'H', '#', 'i', 2,
+        'i', 20, '1', '8', '4', '4', '6', '7', '4', '4', '0', '7', '3', '7', '0', '9', '5', '5', '1', '6', '1', '5',
+        'i', 19, '9', '2', '2', '3', '3', '7', '2', '0', '3', '6', '8', '5', '4', '7', '7', '5', '8', '0', '8'
+    };
+    CHECK(json::to_ubjson(j, true, true) == expected);
+    CHECK(json::from_ubjson(expected) == j);
+}