Lua integration server.cookies does not return multiple cookies (DEV-2300)

[seakayone]

Problem Description

Given an incoming request with multiple cookies,
when calling server.cookies in Lua,
then the returned table contains only a single key/value pair, with the first cookie name as lower case and the rest of the cookie header as value.

This way it is not possible to get an individual cookie value if multiple cookies are in the request because the server.cookies table alway only contains a single entry. Currently we have to get the cookie header and parse the returned string in order to be able to extract a specific cookie.

Expected Behaviour

1. The cookie names in the returned table should be the original case and not lower case
2. The cookie values in the returned table should be the individual values for each cookie. If n cookies are sent with the request then n entries should be in the table.

Link to internal ticket: https://linear.app/dasch/issue/DEV-2300/sipi-lua-integration-servercookies-does-not-return-multiple-cookies

[subotic]

@lrosenth can you maybe also take a look?