Add safe Jackson deserializers to prevent a DoS attack

Jackson uses `BigDecimal` for deserilization of `java.time` instants
and durations. The problem is that if the users sets a very
big number in the scientific notation (like `1e1000000000`), it
takes forever to convert `BigDecimal` to `BigInteger` to convert it to a long value. An example of the stack trace:

```
    @test(timeout = 2000)
    public void parseBigDecimal(){
        new BigDecimal("1e1000000000").longValue();
    }

	at java.math.BigInteger.squareToomCook3(BigInteger.java:2074)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2053)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2051)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2049)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2049)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2055)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.squareToomCook3(BigInteger.java:2049)
	at java.math.BigInteger.square(BigInteger.java:1899)
	at java.math.BigInteger.pow(BigInteger.java:2306)
	at java.math.BigDecimal.bigTenToThe(BigDecimal.java:3543)
	at java.math.BigDecimal.bigMultiplyPowerTen(BigDecimal.java:3676)
	at java.math.BigDecimal.setScale(BigDecimal.java:2445)
	at java.math.BigDecimal.toBigInteger(BigDecimal.java:3025)
```

A fix would be to reject big decimal values outside of the Instant
and Duration ranges.

See:
[1] FasterXML/jackson-databind#2141
[2] https://reddit.com/r/java/comments/9jyv58/lowbandwidth_dos_vulnerability_in_jacksons/

dropwizard-jackson/src/test/java/io/dropwizard/jackson/JacksonDeserializationOfBigNumbersToDurationTest.java

@@ -64,12 +64,6 @@ public void testCanNotDeserializeValueLessThanMinDuration() {
             () -> objectMapper.readValue("{\"id\": 42, \"duration\": -9223372036854775809}", Task.class));
     }
 
-    @Test(timeout = 2000)
-    public void test(){
-        new BigDecimal("1e1000000000").longValue();
-
-    }
-
     static class Task {
 
         private int id;