fix(ws): fix some panics in websocket impls

[zitsen]

Close TS-3796

[codecov-commenter]

Codecov Report

Merging #226 (142a9e9) into main (d0fe19c) will decrease coverage by 0.26%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
- Coverage   61.59%   61.34%   -0.26%     
==========================================
  Files         101      101              
  Lines       23340    23354      +14     
==========================================
- Hits        14377    14327      -50     
- Misses       8963     9027      +64     

Files Changed	Coverage Δ
taos-ws/src/stmt/mod.rs	80.48% <ø> (ø)
taos-ws/src/query/asyn.rs	72.63% <92.30%> (+0.42%)	⬆️
taos-ws/src/consumer/mod.rs	77.27% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[AdamEECS]

LGTM