fix wasm bug

[LokiWager]

1. filter type is map[string]interface{} not map[interface{}]interface{}
2. init response object
3. call alloc function before reading wasm memory, because wasm memory maybe changes when calling alloc function.

[codecov-commenter]

Codecov Report

Base: 73.36% // Head: 73.29% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (137f09e) compared to base (c820407).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #937      +/-   ##
==========================================
- Coverage   73.36%   73.29%   -0.07%     
==========================================
  Files         133      133              
  Lines       14760    14760              
==========================================
- Hits        10828    10818      -10     
- Misses       3308     3320      +12     
+ Partials      624      622       -2     

Impacted Files	Coverage Δ
pkg/object/mqttproxy/sessioncache.go	49.49% <0.00%> (-10.11%)	⬇️
pkg/filters/headerlookup/headerlookup.go	84.61% <0.00%> (-1.40%)	⬇️
pkg/object/mqttproxy/broker.go	73.25% <0.00%> (-0.63%)	⬇️
pkg/cluster/cluster.go	61.15% <0.00%> (+1.05%)	⬆️

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