Feature/expiredkeys pt1

[kasvith]

Pull Request for issue #81

Description

• Created a new method for get key from db, which checks for expiration
• Added RWMutex to DataNode
• Added expire key ttl command
• Updated keys command to check ttl

Testing Instructions

• Add some keys to db
• Use expire to set expiration
• After that time try Getting all the keys

Excepted Behavior

• Only unexpired keys returned

Actual Behavior

• Only unexpired keys returned

Additional Comments

• Note will not clean at when keys were fetched

[kasvith]

@chyroc can you review?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@7cbc516). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #86   +/-   ##
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  Coverage          ?   78.68%           
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  Files             ?       10           
  Lines             ?      774           
  Branches          ?        0           
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  Hits              ?      609           
  Misses            ?      155           
  Partials          ?       10

Impacted Files	Coverage Δ
internal/arch/command-table.go	72.72% <ø> (ø)

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