Added global token store and sys.tokens() eldritch function for management and enumeration

[KS-7250]

What type of PR is this?

/kind feature
/kind eldritch-function

What this PR does / why we need it:

Adds global token store framework + function for eldritch. Manages tokens obtained from future functions like make_token and impersonate and applies them to the current session as needed.

• sys.tokens(pid: Optional int) -> Result<Vec<BTreeMap<String, Value>>, String>

Example (from eldritch.md edits):

$> sys.tokens()

| active | id | source              |
| ------ | -- | ------------------- |
| True   | 1  | impersonate:pid:700 |

$> pprint(sys.tokens(pid=700))

[
  {
    "pid": 700,
    "privileges": [
      "SeAssignPrimaryTokenPrivilege=disabled",
      "SeIncreaseQuotaPrivilege=disabled",
      "SeTcbPrivilege=enabled",
      "SeSecurityPrivilege=disabled",
      "SeTakeOwnershipPrivilege=disabled",
      "SeLoadDriverPrivilege=disabled",
      "SeProfileSingleProcessPrivilege=enabled",
      "SeIncreaseBasePriorityPrivilege=enabled",
      "SeCreatePermanentPrivilege=enabled",
      "SeBackupPrivilege=disabled",
      "SeRestorePrivilege=disabled",
      "SeShutdownPrivilege=disabled",
      "SeDebugPrivilege=enabled",
      "SeAuditPrivilege=enabled",
      "SeSystemEnvironmentPrivilege=disabled",
      "SeChangeNotifyPrivilege=enabled",
      "SeUndockPrivilege=disabled",
      "SeManageVolumePrivilege=disabled",
      "SeImpersonatePrivilege=enabled",
      "SeCreateGlobalPrivilege=enabled",
      "SeTrustedCredManAccessPrivilege=disabled"
    ],
    "user": "NT AUTHORITY\\SYSTEM"
  }
]

Which issue(s) this PR fixes:

N/A