Add IsRunning and Stop methods to Node interface

[Manav-Aggarwal]

Closes: #705

[codecov-commenter]

Codecov Report

Base: 54.59% // Head: 54.75% // Increases project coverage by +0.15% 🎉

Coverage data is based on head (4ab7658) compared to base (018e42a).
Patch coverage: 53.52% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #714      +/-   ##
==========================================
+ Coverage   54.59%   54.75%   +0.15%     
==========================================
  Files          52       52              
  Lines       10372    10363       -9     
==========================================
+ Hits         5663     5674      +11     
+ Misses       3840     3824      -16     
+ Partials      869      865       -4     

Impacted Files	Coverage Δ
config/config.go	88.88% <ø> (ø)
conv/addr.go	100.00% <ø> (ø)
conv/config.go	47.05% <ø> (ø)
da/celestia/celestia.go	50.00% <ø> (ø)
da/celestia/mock/server.go	49.68% <ø> (ø)
da/grpc/grpc.go	73.13% <ø> (ø)
da/mock/mock.go	73.75% <ø> (ø)
da/registry/registry.go	100.00% <ø> (ø)
mempool/v1/mempool.go	86.09% <ø> (ø)
node/full.go	60.43% <0.00%> (ø)
... and 27 more

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[tuxcanfly]

OK.