Expose boards APIs for MPA (#21917)

* add first batch of Boards service APIs for MPA

go.sum

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@@ -979,6 +981,8 @@ github.com/markbates/oncer v0.0.0-20181203154359-bf2de49a0be2/go.mod h1:Ld9puTsI
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@@ -987,6 +991,8 @@ github.com/mattermost/ldap v0.0.0-20201202150706-ee0e6284187d h1:/RJ/UV7M5c7L2TQ
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@@ -1028,7 +1034,6 @@ github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A
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@@ -2282,8 +2287,9 @@ k8s.io/kubernetes v1.13.0/go.mod h1:ocZa8+6APFNC2tX1DZASIbocyYT5jHzqFVsY5aoB7Jk=
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