Update Cors ExposedHeaders

[emmanueldenloye]

No description provided.

[enobayram]

I've verified this PR by making a /txs/account request and observing the expected new Access-Control-Expose-Headers header:

$ curl -v -H "Origin: example.com" "<cwd-url>/txs/account/k:f00e8e0fd5276ec62aeea0cd07b1d44bf737c5f63bca5d6ea22d69d71297d2f2?limit=1"
...
> GET /txs/account/k:f00e8e0fd5276ec62aeea0cd07b1d44bf737c5f63bca5d6ea22d69d71297d2f2?limit=1 HTTP/1.1
...
> Origin: example.com
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Transfer-Encoding: chunked
< Date: Fri, 09 Dec 2022 22:51:50 GMT
< Server: Warp/3.3.20
< Content-Type: application/json;charset=utf-8
< Chainweb-Next: KDMyNzMxODMsIlNZX3F6RFBLMUU5Mi1LNWJ4SnZwcUpsNlFWUjl3N2tGbE5KZ0REYmMxZVUiLDAp
< Access-Control-Allow-Origin: *
< Access-Control-Expose-Headers: Chainweb-Next
...
[{"amount":5.81e-4,"height":3273183,"chainid":0,"blockHash":"0bc8ZxQtH6SPnZaKpu74rHDxERVlSV-lqHd1tmiejrE","requestKey":"SY_qzDPK1E92-K5bxJvpqJl6QVR9w7kFlNJgDDbc1eU","name":"coin","fromAccount":"k:f00e8e0fd5276ec62aeea0cd07b1d44bf737c5f63bca5d6ea22d69d71297d2f2","toAccount":"k:8372f0a8661247e39971ff2551a5e95de4110b8c090f5ddd93eb6fbb7d13d732","idx":0}]

[enobayram]

LGTM!