docs(proposal): manifest hydrator (argoproj#17755)

* docs(proposal): manifest hydrator

Signed-off-by: Michael Crenshaw <[email protected]>

* whitespace

Signed-off-by: Michael Crenshaw <[email protected]>

* whitespace

Signed-off-by: Michael Crenshaw <[email protected]>

* remove old references to drySources as an array

Signed-off-by: Michael Crenshaw <[email protected]>

* rename fields

Signed-off-by: Michael Crenshaw <[email protected]>

* opinions

Signed-off-by: Michael Crenshaw <[email protected]>

* document limitations

Signed-off-by: Michael Crenshaw <[email protected]>

* updates

Signed-off-by: Michael Crenshaw <[email protected]>

* updates

Signed-off-by: Michael Crenshaw <[email protected]>

* multi-source is nondeterministic

Signed-off-by: Michael Crenshaw <[email protected]>

* Update docs/proposals/manifest-hydrator/commit-server/README.md

Co-authored-by: joe miller <[email protected]>
Signed-off-by: Michael Crenshaw <[email protected]>

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Signed-off-by: Michael Crenshaw <[email protected]>
Co-authored-by: joe miller <[email protected]>