feat: implement host.setSecretFile() to securely set binary files a…

…s secrets (#5500)

* feat: implement host.setSecretFile() method to securely mount binary files

Solves binary data issue (dagger/dagger#5069):
Some users need to mount binary files or non UTF-8 files (GPG keys for example) as secrets.
This PR implements a new API endpoints enabling a safe mount of those secrets without leaking information in any layer.

Signed-off-by: grouville <[email protected]>

* chore: add changelog

Add Changie's changelogs

Signed-off-by: grouville <[email protected]>

* Remove sdk change logs as it's an engine change

Signed-off-by: Helder Correia <[email protected]>

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Signed-off-by: grouville <[email protected]>
Signed-off-by: Helder Correia <[email protected]>
Co-authored-by: grouville <[email protected]>
Co-authored-by: Helder Correia <[email protected]>