feat(vault): support custom metadata.

[Zenithar]

Context

Vault 1.9 will support custom metadata with constraints.

Each secret also has version-agnostic metadata. This data can contain a custom_metadata field of
user-provided key-value pairs. Vault imposes the following custom metadata limits:

	Limit
Number of custom metadata key-value pairs	64
Custom metadata key size	128 bytes
Custom metadata value size	512 bytes

Sample

Instrument your secret specification by adding annotations and/or labels

By default, with --with-metadata flag, secret metadata are stored in a reserved key inside the secret data

If you are using >Vault 1.9, you can use --with-vault-metadata to enable custom_metadata storage

When you need to restore the Bundle from Vault, you have to use --with-metadata or --with-vault-metadata flag to pull metadata from secret storage and rebuild Bundle package information.

Reference(s)

• Add kv custom key metadata hashicorp/vault#12218