fix wasm apply-data command

[grootpiano]

fixes #938 and some doc issues

Changes in wasm apply-data command:

1. use YAMLVisitor instead of SpecVisitor
2. use wasmApplyData handler instead of createObject handler

[codecov-commenter]

Codecov Report

Base: 73.37% // Head: 73.38% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (2a45eb1) compared to base (0913eef).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #939      +/-   ##
==========================================
+ Coverage   73.37%   73.38%   +0.01%     
==========================================
  Files         133      133              
  Lines       14760    14760              
==========================================
+ Hits        10830    10832       +2     
+ Misses       3307     3306       -1     
+ Partials      623      622       -1     

Impacted Files	Coverage Δ
pkg/filters/headerlookup/headerlookup.go	84.61% <0.00%> (-1.40%)	⬇️
pkg/object/mqttproxy/broker.go	73.87% <0.00%> (+0.15%)	⬆️
pkg/cluster/cluster.go	61.15% <0.00%> (+0.52%)	⬆️

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