add support for network wasm filters (#2904)

* add support for network wasm filters

Signed-off-by: Rama Chavali <[email protected]>

* add undefined

Signed-off-by: Rama Chavali <[email protected]>

* move to top level enum

Signed-off-by: Rama Chavali <[email protected]>

* move to caps

Signed-off-by: Rama Chavali <[email protected]>

* add more docs

Signed-off-by: Rama Chavali <[email protected]>

* fix comments

Signed-off-by: Rama Chavali <[email protected]>

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Signed-off-by: Rama Chavali <[email protected]>

Author: ramaraochavali