Add PostgreSQL::Test::Cluster::is_alive()

This new routine acts as a wrapper of pg_isready, that can be run on a
node to check its connection status.  This will be used in a recovery
test in a follow-up commit.

Suggested-by: Andres Freund <and...@anarazel.de>
Author: Nazir Bilal Yavuz <byavu...@gmail.com>
Discussion: 
https://postgr.es/m/CAN55FZ1D6KXvjSs7YGsDeadqCxNF3UUhjRAfforzzP0k-cE=b...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d4c9195eff419dcad47d5c2137e31f790c32adde

Modified Files
--------------
src/test/perl/PostgreSQL/Test/Cluster.pm | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

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