Add support for FRR and setkey Bidirectional

[michmoor0725]

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Is your feature request related to a problem? Please describe.
When setting up BGP peering with the password with a pfSense, OPNsense does not support the FRR and setkey Bidirectional
which is the much more secure way of implementing TCP MD5.
Relevant documentation: https://docs.netgate.com/pfsense/en/latest/packages/frr/bgp/config-neighbor.html

bgp peering does fail when suing setkey Bidirectional which indicates to me that OPNsense does not support that feature.

A clear and concise description of what the problem is including your motivation for the request,
i.e. "For the purpose of [...] I am missing a solution that will [...]."

Describe the solution you like
Support FRR and setkey Bidirectional when using BGP

A clear and concise description of what you want to happen.
Support FRR and setkey Bidirectional when using BGP

Describe alternatives you considered
The alternative is to use FRR and setkey Outbound which is less secure and does work with OPnsense.

[mimugmail]

I thought that we use both directions but needs to be the same

[AdSchellevis]

we do, there's no "outbound only" option on our end, relevant code sections below:

https://github.com/opnsense/plugins/blob/15ddd7ba9ec847fce158ed9c9717ac9f9f5f63f6/net/frr/src/opnsense/scripts/frr/register_sas#L35

https://github.com/opnsense/plugins/blob/15ddd7ba9ec847fce158ed9c9717ac9f9f5f63f6/net/frr/src/opnsense/service/templates/OPNsense/Quagga/sa_policies.conf#L19

https://github.com/opnsense/plugins/blob/15ddd7ba9ec847fce158ed9c9717ac9f9f5f63f6/net/frr/src/opnsense/service/templates/OPNsense/Quagga/bgpd.conf#L125

[michmoor0725]

So to confirm it is supported?