fix: correct type of runInTransactionAsync

[wschurman]

Why

Not sure why this wasn't an issue before but when upgraded to 0.7.0 this incorrect typing started showing up.

How

Fix the typing to be more specific so that methods within transaction blocks that typehint to require a transaction (only take an EntityTransactionalQueryContext instead of the superclass EntityQueryContext) don't fail to compile.

Test Plan

yarn tsc

[codecov]

Codecov Report

Merging #81 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #81   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files          60       60           
  Lines        1522     1522           
  Branches      181      181           
=======================================
  Hits         1440     1440           
  Misses         80       80           
  Partials        2        2           

Flag	Coverage Δ
#integration	?
#unittest	94.61% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/entity/src/ReadonlyEntity.ts	100.00% <100.00%> (ø)

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