Adjust paramer type in AddBreadcrumb

[jairbubbles]

Always better to use a concrete type, also it's now consistent with the other extension method.

[Tyrrrz]

Looks good @jairbubbles.
Can you please add a quick changelog entry? Should be something like this (in ## Unreleased section):

- Adjust paramer type in `AddBreadcrumb` to use `IReadOnlyDictionary<...>` instead of `Dictionary<...>` [#1000](https://github.com/getsentry/sentry-dotnet/pull/1000)

[codecov-commenter]

Codecov Report

Merging #1000 (dd8d3a1) into main (984b210) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1000   +/-   ##
=======================================
  Coverage   81.22%   81.22%           
=======================================
  Files         184      184           
  Lines        5903     5903           
  Branches     1454     1454           
=======================================
  Hits         4795     4795           
  Misses        691      691           
  Partials      417      417           

Impacted Files	Coverage Δ
src/Sentry/IHasBreadcrumbs.cs	44.44% <ø> (ø)

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[jairbubbles]

@Tyrrrz Done!

[Tyrrrz]

Thanks!

[bruno-garcia]

Thanks @jairbubbles !