[#598] Implemented major topic namespace changes for v4

[wes-johnson]

Adopt #598: Topic Prefix + Expanded MQTT Topic (device_tokens) for Sparkplug 4

Implements the topic-namespace changes agreed for #598.

Topic structure

Old: namespace/group_id/message_type/edge_node_id/[device_id]
New: [topic_prefix/]namespace/message_type/edge_node_id/[device_tokens]

• Group ID removed, replaced by an optional, multi-level Topic Prefix that precedes the spCv1.0 namespace element (namespace-root grouping and ACL scoping). The STATE topic remains unprefixed.
• device_id generalized to device_tokens — one or more trailing levels that identify a Sparkplug Device on the 'D' message types, and that may also relocate leading folders of a metric name onto the topic. 'N' message types never carry device_tokens.
• Edge Node uniqueness is now keyed on topic_prefix + edge_node_id.

New concepts (defined normatively)

• Sparkplug Descriptors — the Edge Node Descriptor (topic_prefix + edge_node_id) and the Device Descriptor (topic_prefix + edge_node_id + device_tokens).
• Fully-qualified metric name — topic_prefix / edge_node_id / device_tokens / metric name.
• descriptor_seq — a per-Sparkplug-Descriptor payload sequence number (in addition to the Edge-Node-wide seq) so a consumer can detect a gap on one specific Descriptor's BIRTH/DATA stream.
• Command topics MUST match the target's BIRTH/DATA topic form (a Host MUST NOT swap metric-prefix tokens with device_tokens).
• The namespace element denotes one of two valid namespaces: spCv1.0 (protobuf) and spJv1.0 (JSON, forthcoming).

Scope

Chapters updated: Introduction, Topics, Operational Behavior, Payloads, Security (ACL example), HA, Conformance, Appendix A, plus the three metric-structure diagrams. Examples reworked to a Unified Namespace / ISA-95 style (Acme/Dublin/Packaging / EdgeNode1 / Filler). Editorial cleanup: em-dashes and stray semicolons removed from prose; "broker" changed to "MQTT Server".

TCK

• Monitor.java updated to the renamed statement IDs and section anchors. Usages of the removed device_id uniqueness/duplication statements are stubbed with // TODO(#598).
• AwareBrokerTest.java re-pointed to CONFORMANCE_MQTT_AWARE_BASIC to fix a pre-existing conformance-chapter staleness (unrelated to Sparkplug 4: Expanded MQTT Topic : Move "group" to be ahead of spBv1.0 #598) so the module compiles.

The TCK now compiles and builds, but the topic-parsing model (Monitor / Topic / EdgeNodeDescriptor) still assumes the old structure and needs a rewrite for functional coverage — tracked as follow-up.