feat: Implement custom hybrid un-/marshal model

[alpe]

Description

Closes: #22525

Please note, there are some small changes to the examples in the issue. This is due to the internal normalization that the GDA type does. We can change that, too but IMHO the decimal notation looks fine.

1234567 is not marshalled to 1.234567E+6 but stays in the decimal form. Please see the numbers below what the implementation does:

0			-> 0
0.0000001	-> 1E-7
0.000001	-> 1E-6
0.00001		-> 0.00001
0.0001		-> 0.0001
0.001		-> 0.001
100			-> 100
1000		-> 1000
10000		-> 10000
100000		-> 100000
1000000		-> 1E+6
1234567		-> 1234567
12345678	-> 12345678
123456789	-> 123456789
1234567890	-> 1234567890
12345678900	-> 12345678900

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[github-actions]

@alpe your pull request is missing a changelog!