ipoe: encapsulate statistics counters

Group the IPOE starting, active, and delayed offer statistics in struct ipoe_stat_t and keep the storage private to ipoe.c instead of exposing writable stat_* globals. This keeps ownership inside the IPOE control code while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.

Route counter updates through ipoe_stat_*() helpers. Session setup, activation, teardown, and delayed offer queue paths no longer open-code individual counter increments/decrements; the update policy now lives beside the IPOE-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 IPOE SNMP starting/active scalars from watched raw pointers to scalar handlers. SNMP now reads through ipoe_stat_starting() and ipoe_stat_active(), removing the old ipoe_get_stat() pointer escape hatch.

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

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