Extract parts of the SHI data vector as a luxtronik field dictionary

[Guzz-T]

The new field dictionary replaces the standard dictionary created in the data vector constructor.
This makes it possible to create multiple definitions with different data types for an index.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
luxtronik
__main__.py	25	25	0%	3–62
data_vector.py	115	1	99%	42
datatypes.py	399	2	99%	57, 127
discover.py	58	1	98%	63
luxtronik/cfi
interface.py	149	13	91%	79–92, 241–242, 247
parameters.py	31	1	97%	49
luxtronik/scripts
__init__.py	16	16	0%	3–28
discover_shi.py	60	60	0%	8–98
dump_changes.py	43	43	0%	7–85
dump_luxtronik.py	26	26	0%	6–52
dump_shi.py	19	19	0%	7–40
performance_shi.py	63	63	0%	7–89
watch_shi.py	38	38	0%	7–85
luxtronik/shi
contiguous.py	136	2	99%	265–266
TOTAL	2307	310	87%

Tests	Skipped	Failures	Errors	Time
376	0 💤	0 ❌	0 🔥	28.806s ⏱️