Introduce the skeleton and high level decl definition of the omni schema plugin.

[jf-tech]

No description provided.

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master       #19    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           13        15     +2     
  Lines          220       332   +112     
==========================================
+ Hits           220       332   +112     

Impacted Files	Coverage Δ
testlib/mockReaderCloser.go	100.00% <ø> (ø)
omniparser/parser.go	100.00% <100.00%> (ø)
omniparser/schemaplugin/omni/v2/plugin.go	100.00% <100.00%> (ø)
omniparser/schemaplugin/omni/v2/transform/decl.go	100.00% <100.00%> (ø)
strs/strs.go	100.00% <100.00%> (ø)

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