Disallow .json()/.text() outside of context

[Dreamsorcerer]

Consistent with .read() behaviour.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.42%. Comparing base (63cfd5f) to head (a107164).
Report is 1043 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9254      +/-   ##
==========================================
+ Coverage   98.36%   98.42%   +0.06%     
==========================================
  Files         107      107              
  Lines       34740    34760      +20     
  Branches     4121     4123       +2     
==========================================
+ Hits        34171    34213      +42     
+ Misses        398      380      -18     
+ Partials      171      167       -4     

Flag	Coverage Δ
CI-GHA	98.31% <100.00%> (+0.05%)	⬆️
OS-Linux	97.97% <100.00%> (+0.05%)	⬆️
OS-Windows	96.36% <100.00%> (+0.10%)	⬆️
OS-macOS	97.65% <100.00%> (+0.07%)	⬆️
Py-3.10.11	97.74% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.68% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.58% <100.00%> (?)
Py-3.11.9	97.64% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	98.03% <100.00%> (+0.40%)	⬆️
Py-3.9.13	97.63% <100.00%> (?)
Py-3.9.20	97.57% <100.00%> (+0.09%)	⬆️
Py-pypy7.3.16	97.18% <100.00%> (?)
VM-macos	97.65% <100.00%> (+0.07%)	⬆️
VM-ubuntu	97.97% <100.00%> (+0.05%)	⬆️
VM-windows	96.36% <100.00%> (+0.10%)	⬆️

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