feat: fit the message cap, the pools, the ring and the stacks to this device

[DavidCozens]

Fit the compile-time sizes to what this device uses, now that every collaborator is in place.

The message cap comes first, because the ring, the store's record buffer and the formatter frame on
both task stacks all follow it.

/* app/config/solid_syslog_tunables.h */
#define SOLIDSYSLOG_MAX_MESSAGE_SIZE 400U

#define SOLIDSYSLOG_ADDRESS_POOL_SIZE 1U
#define SOLIDSYSLOG_TCP_STREAM_POOL_SIZE 1U
#define SOLIDSYSLOG_STREAM_SENDER_POOL_SIZE 1U

The worst case measured here is 345 octets: the four SD-ELEMENTs with both counters at full 32-bit
width and both addresses at fifteen characters, plus a short message. 400 allows for longer messages
on this device. Anything longer is truncated rather than dropped.

The pool defaults suit a device running several transports at once. This one runs a single sender
over a single stream to a single destination.

The overrides reach the library through SOLIDSYSLOG_USER_TUNABLES_FILE, an absolute path quoted
for the preprocessor and given to every group that includes a SolidSyslog header: Core, the platform
sources and this application. They change struct sizes, and a build where only some translation
units saw them would disagree about how big those structs are.

The ring drops from eight records to four. The store holds a backlog, so the ring only has to absorb
what can be logged while the service task is sending.

The task stacks go last, at twice their measured high-water marks rounded up to a whole
configMINIMAL_STACK_SIZE.

When you need it. Once the pipeline is complete. Sizing earlier means sizing against a device
that is still missing collaborators.

[DavidCozens]

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