Add support for Dynamic Security Groups

[Didainius]

This PR adds support for Dynamic Security Groups (or as they are called in API - Firewall Groups).
It reuses the same functions we already have (because IP sets, Static Security Groups and Dynamic Security Groups use the same API), but expands a few places to accommodate Dynamic Security Group handling in VCD 10.3+:

• Expand types.NsxtFirewallGroup with new fields introduced with API V36.0 (VCD 10.3)
• New constant types.FirewallGroupTypeVmCriteria to match Dynamic Security Group type of Firewall group.
• API elevation to 36.0 when available so that Dynamic security groups can be handled.
• Additional test Test_NsxtDynamicSecurityGroup to checkout Dynamic security group creation.
• NsxtFirewallGroup.IsDynamicSecurityGroup() function to validate that given Firewall Group is Dynamic Security Group
• Additional Firewall Group functions with *VdcGroup pointer receiver
• Internal function getFirewallGroupTypeFilterFieldName for embedding into Security Group management functions as new field TypeValue must be used instead of now deprecated one Type which doesn't support Dynamic Firewall Groups.

More about Dynamic Security Groups in VCD official docs and VMware Blog post:

• https://docs.vmware.com/en/VMware-Cloud-Director/10.3/VMware-Cloud-Director-Tenant-Portal-Guide/GUID-CF7FCFE1-7B1C-45CE-B8A0-774E9CD31DB5.html
• https://blogs.vmware.com/cloudprovider/2021/08/vmware-cloud-director-10-3-new-networking-security-features.html

[lvirbalas]

Just a few asks :)