Support cookies (#38)

* Support cookies

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

* Address existing GH reviews

- Add RAK_SEND_COOKIE to DefaultRakServerConfig#getOptions()
- Consolidate RakClientOfflineHandler#sendOpenConnectionRequest2 to single method
- Combine pendingConnections ExpiringMap

Signed-off-by: GitHub <noreply@github.com>

* Remove unused packages

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

* Create provider for preferred SecureRandom algorithm

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

* preferredAlgorithms in block

* Why we should not do web edits

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

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Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>
Signed-off-by: GitHub <noreply@github.com>