🧹 Remove GetValue<T>() from Dictionary

[greymistcube]

Few points:

• GetValue<T>() syntax was incomplete (relied on implicit casting of Text and Binary, which no longer works). [] syntax already does the job better.
• Didn't really provide much convenience. I'd say usage of (T)[] is more recommended than using GetValue<T>()

I've already removed all usage of GetValue<T>() from libplanet.

[CLAassistant]

All committers have signed the CLA.

[pull-request-quantifier-deprecated]

This PR has 187 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Medium
Size       : +12 -175
Percentile : 57.4%

Total files changed: 3

Change summary by file extension:
.cs : +10 -175
.md : +2 -0

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

Why proper sizing of changes matters

Optimal pull request sizes drive a better predictable PR flow as they strike a
balance between between PR complexity and PR review overhead. PRs within the
optimal size (typical small, or medium sized PRs) mean:

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    iterations.
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• Review quality is likely higher as complexity is lower:
  • Bugs are more likely to be detected.
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  • Small portions can be assimilated better.
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  • Exercising separation of concerns within the code changes.

What can I do to optimize my changes

• Use the PullRequestQuantifier to quantify your PR accurately
  • Create a context profile for your repo using the context generator
  • Exclude files that are not necessary to be reviewed or do not increase the review complexity. Example: Autogenerated code, docs, project IDE setting files, binaries, etc. Check out the Excluded section from your prquantifier.yaml context profile.
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How to interpret the change counts in git diff output

• One line was added: +1 -0
• One line was deleted: +0 -1
• One line was modified: +1 -1 (git diff doesn't know about modified, it will
  interpret that line like one addition plus one deletion)
• Change percentiles: Change characteristics (addition, deletion, modification)
  of this PR in relation to all other PRs within the repository.

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