sstp: encapsulate statistics counters

Group the SSTP starting and active statistics in struct sstp_stat_t and keep the storage under the SSTP server object instead of exposing writable stat_* globals. This keeps ownership inside the SSTP control code while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.

Route counter updates through sstp_stat_*() helpers. Connection accept, transition to PPP setup, and disconnect paths no longer open-code individual counter increments/decrements; the update policy now lives beside the SSTP-owned storage and uses relaxed atomic operations for the simple state counters.

Make the CLI show-stat path render from a local snapshot and convert the SSTP SNMP starting/active scalars from watched raw pointers to scalar handlers. SNMP now reads through sstp_stat_starting() and sstp_stat_active(), removing the old sstp_get_stat() pointer escape hatch.

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

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