Nexus API should limit the number of firewall rules

[bnaecker]

There does not appear to be a limit on the number of firewall rules that a user can express in an API call to Nexus. We should probably add one to avoid huge requests or blowing up OPTE itself with a massive number of rules to match.

[david-crespo]

Will need to test it, but this compiles and the OpenAPI schema generates fine. It might be as easy as this.

#[derive(Clone, Debug, Deserialize, Serialize, JsonSchema)]
pub struct VpcFirewallRuleUpdateParams {
    #[schemars(length(max = 32))]
    pub rules: Vec<VpcFirewallRuleUpdate>,
}

[bnaecker]

That would be great! I think we might need to add some constraints on the VpcFirewallRuleFilter inside these as well, but I'm not sure how to combine those.