future updates, upgrade of api translator and adaptation to supported features requierement for new release

Event feature documentation and small changes in the code, tested and change in mistake in capif_sdk_config

PR:

Final Apache 2.0 license file set,
Updated and improved images describing full SDK flow.
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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>

PR:

AEF security implementation within the provider api publication and invoker,
Documentation updated,
Fixed little mistakes related to renaming, loading initial data, etc,
Tests modified,
License Apache 2 for ETSI added.

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>

PR:

Data structure definition in code
provider_ids from json to dictionary
Change invoker dictionaries

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>

PR:
- Improved documentation,
- Added and improved network-app samples,
- License draft v0.1.

---------

Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>

PR:
- Included complete Network App samples,
- Complete developer path description,
- Refactored code structure,
- Complete doc upgrade.

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Co-authored-by: JorgeEcheva26 <jorge.echevarriauribarri.practicas@telefonica.es>
Co-authored-by: Daniel García <daniel.garciasanchez@telefonica.com>