Add IMDSV2 Support

[Tohmua]

Adds Support For IMDSV2

Fixed issue #146

Add support for the Instance Metadata Service V2 as using version 1 of the Instance Metadata Service is prone to publicly known weaknesses.

[siourdas-vasilis]

Hello @Tohmua can you add also the rest of the variables of the metadata_options like this PR https://github.com/Guimove/terraform-aws-bastion/pull/148 ? ( Excuse my PR I did not see yours before )

[Tohmua]

Hello @Tohmua can you add also the rest of the variables of the metadata_options like this PR #148 ? ( Excuse my PR I did not see yours before )

Yea ofc, sorry missed this. Ill update this tonight :)

[Tohmua]

Hey @siourdas-vasilis I added the extra options to my PR.

I preferred your approach of grouping them as a single variable / object rather than keeping them all as sepoarte variables... however I left it like this for consistency with how the rest of the project is structured.

Maybe @Guimove can comment on how they would prefer this to be structured as the owner :)

[siourdas-vasilis]

@Guimove pinging this.

[TomBerriot]

Hello :) We would also want to be able to customize metadata options for security reasons :eyes: Could we help in anyway make this PR go forward ? :pray: @Guimove

[hamsec-aumni]

Same goes for us.