Cardano Updates

Add Named benchmark functions to Common.hs that accept an explicit group
name, and use them in Strings.hs to produce ByteLength-suffixed benchmark
groups using the TextCostingByteLength wrapper. This generates the CSV
data needed to fit CPU cost parameters against byte-length (rather than
character-count) for PV11+ cost model variants D/E.

Also updates stale UTF-16 comments in Strings.hs to reflect text-2.x
(UTF-8) internals.

Revert ExMemoryUsage Text to character count (pre-PV11 metric) and introduce
TextCostingByteLength newtype for byte-based costing in PV11+ (semvar D/E).
AppendString, EqualsString, EncodeUtf8, DecodeUtf8 dispatch on semvar to
select the appropriate costing metric. Generators corrected to remove stale
text-1.x UTF-16 multiplier. Cost model parameters re-benchmarked accordingly.

Add TextCostingByteLength cases to test generators (smallConstant, genConstant),
update golden signature tests for per-semvar dispatch, and accept new conformance
budget values.

The byte-length formula gives 1 for empty strings (was 0 under character
count). Add an explicit guard so the empty case stays at 0, avoiding any
cost increase for existing scripts.

Currently using ghc-9.14.1 (first 9.14 release).

Currently using ghc-9.14.1 (first 9.14 release).

This was needed because `cardano-crypto-class >=2.3` depends on a
deprecated version of `cardano-binary` and there is net yet a new
version of `cardano-binary`.

Add TextCostingByteLength cases to test generators (smallConstant, genConstant),
update golden signature tests for per-semvar dispatch, and accept new conformance
budget values.

Revert ExMemoryUsage Text to character count (pre-PV11 metric) and introduce
TextCostingByteLength newtype for byte-based costing in PV11+ (semvar D/E).
AppendString, EqualsString, EncodeUtf8, DecodeUtf8 dispatch on semvar to
select the appropriate costing metric. Generators corrected to remove stale
text-1.x UTF-16 multiplier. Cost model parameters re-benchmarked accordingly.