build(esm): dynamically generate package.json for ESM build

[Gitarcitano]

Description

This pull request addresses a warning emitted by Webpack that occurs when building the project. The warning indicates the absence of a version specification in the package.json of the dist/esm directory. To rectify this, I have implemented a solution to automatically copy the version from the main package.json to the dist/esm/package.json upon each successful build. This resolves the warning and ensures the version information is consistently propagated to the built package.

Changes Made

• Implemented an automatic version copying script from package.json to dist/esm/package.json after every build.
• Modified the existing build script to incorporate the new version copying functionality.
• Removed unnecessary static package.json

How to Test

1. Run the build process using the provided build script.
2. Verify that the version in package.json matches the version in dist/esm/package.json.
3. Confirm that the webpack warning related to the missing version is no longer present.

Checklist

• This PR makes changes to the public API
• I have included links for closing relevant issue numbers

[Gitarcitano]

Hey @pamapa , here is the PR applying the change you suggested here: authts/react-oidc-context#936 (comment)

[pamapa]

awesome, thanks for contributing

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (46483ce) 77.92% compared to head (5a5704a) 77.92%.
Report is 3 commits behind head on main.

Additional details and impacted files

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##             main    #1187   +/-   ##
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  Coverage   77.92%   77.92%           
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  Files          45       45           
  Lines        1726     1726           
  Branches      346      346           
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  Hits         1345     1345           
  Misses        342      342           
  Partials       39       39           

Flag	Coverage Δ
unittests	77.92% <ø> (ø)

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