Signed-off-by: Roshan Khatri <rvkhatri@amazon.com>

…er search

When a set command like SADD receives an integer value and the set is
listpack-encoded, the previous code converted the integer to a string to
call lpFind(), which then converted it back to an integer internally.

Add lpFindInteger() that accepts a long long directly and compares against
integer-encoded listpack entries without any string conversion. Use it in
setTypeAdd() when the value arrived as an integer (str == tmpbuf).

Fixes valkey-io#3408

Signed-off-by: liveprasad <prasad.shetkar093@gmail.com>
(cherry picked from commit 7d2e056)