Transfer registry path via gRPC metadata

[NikitaSkrynnik]

Description

The main idea: We add Path for registry to check it in Registry Authorization chain elements. The logic of path is the same as in networkservice.

Added chain elements:

1. grpcmetadata - Transfers registry path via gRPC metadata. Contains Path data structure and methods that get and put path to context.
2. updatepath - Constructs private path during registration of NS or NSE in registry. Uses context methods from grpcmetadata package.
3. updatetoken - Adds and updates tokens and expiration time for path segments. Also adds tokens to path_ids field in NetworkService and NetworkServiceEndpoint messages.
4. Authorize client chain elements - chain elements that check registry path using policies on response from registry.

Other changes:

• Added new policy that checks path_ids of NS and NSE messages.
• Reworked some registry unit tests that used raw connections to registry. Now they use Registry Client to connect to registry.
• All chain elements that are necessary for registry path were added to all registry components (nsmgr, proxy-dns, nsmgr-proxy, registry-client, registry-memory)
• Reworked sandbox test token generation functions. It was necessary for updatetoken chain element.

Issue link

#1367

How Has This Been Tested?

• Added unit testing to cover
• Tested manually
• Tested by integration testing
• Have not tested

Types of changes

• Bug fix
• New functionallity
• Documentation
• Refactoring
• CI

[denis-tingaikin]

@NikitaSkrynnik Could you rebase this one?

[denis-tingaikin]

Please fix the remaining comments and they can be merged.

@glazychev-art Do you have any other comments?

[denis-tingaikin]

Suggested change

name string

[denis-tingaikin]

Suggested change

name := s.name

[denis-tingaikin]

@NikitaSkrynnik Apply this for other similar places

[denis-tingaikin]

Suggested change

	if spiffeID, idErr := spire.SpiffeIDFromContext(ctx); idErr == nil {
	name = spiffeID.Path()
	}
	if spiffeID, err := spire.SpiffeIDFromContext(ctx); err == nil {
	return err
	}

[denis-tingaikin]

@NikitaSkrynnik Lets merge this and consider the remaining comments in the separate PR.