Add overloads to setExpiration and setIssuedAt

[Aleksander-Dorkov]

Hello, do you have the time to add overloads to the methods setExpiration and setIssuedAt of Jwts.builder() that accept LocalDateTime instead of the Date class, witch was kind of deprecated (not rly, but almost) 10 years go.

        Instant now = Instant.now();
        JwtBuilder jwtBuilder = Jwts.builder()
                .setId(UUID.randomUUID().toString())
                .setSubject(userDetails.getId().toString())
                .claim("username", userDetails.getUsername())
                .claim("authorities", authorities)
                .setIssuedAt(Date.from(now))
                .setExpiration(Date.from(now.plus(1, ChronoUnit.DAYS)))
                .signWith(KEY);

Instead of the code above can we have

        JwtBuilder jwtBuilder = Jwts.builder()
                .setId(UUID.randomUUID().toString())
                .setSubject(userDetails.getId().toString())
                .claim("username", userDetails.getUsername())
                .claim("authorities", authorities)
                .setIssuedAt(LocalDateTime.now())
                .setExpiration(LocalDateTime.now().plus(1, ChronoUnit.DAYS))
                .signWith(KEY);

It should be fairly simple, because you just convert them to a unix timestamp, if I am not mistaking.

[lhazlewood]

Closing as duplicate of #662