Add eCloud VPC VPN Gateway management commands

[Xiol]

Adds support for VPN Gateways on VPC.

As noted in SDK PR, there are two small pieces of functionality which have been implemented here but aren't yet supported API-side. This should be resolved soon. This doesn't affect overall functionality.

[github-actions]

Qodana for Go

3584 new problems were found

Inspection name	Severity	Problems
Unhandled error	🔶 Warning	2123
Unused parameter	🔶 Warning	187
Redundant types in composite literals	🔶 Warning	43
Deprecated element	🔶 Warning	6
Unused function	🔶 Warning	4
Unused exported function	🔶 Warning	3
Imported package name as a name identifier	🔶 Warning	2
Missing 'case' statements for 'iota' consts in 'switch'	🔶 Warning	2
Bool condition	🔶 Warning	1
Error string should not be capitalized or end with punctuation	◽️ Notice	972
Redundant import alias	◽️ Notice	194
Name starts with a package name	◽️ Notice	28
Type assertion on errors fails on wrapped errors	◽️ Notice	8
Redundant parentheses	◽️ Notice	4
Empty slice declared using a literal	◽️ Notice	3
Redundant type conversion	◽️ Notice	2
Type can be omitted	◽️ Notice	2

☁️ View the detailed Qodana report

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[0x4c6565]

LGTM

[Xiol]

Updated go.mod to pull correct SDK tag now that's released