Manager: Query peer heights lazily while catching up

[omerfirmak]

If we have unresponsive peers, the initial act of querying
each peer for their ledger heights could take a lot of time.

could help https://github.com/bosagora/agora/issues/3206

[codecov[bot]]

Codecov Report

Merging #3208 (1f07628) into v0.x.x (0c35bfe) will decrease coverage by 8.31%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v0.x.x    #3208      +/-   ##
==========================================
- Coverage   87.48%   79.16%   -8.32%     
==========================================
  Files         166      212      +46     
  Lines       16927    19110    +2183     
==========================================
+ Hits        14808    15128     +320     
- Misses       2119     3982    +1863     

Flag	Coverage Δ
integration	14.35% <ø> (?)
unittests	87.37% <100.00%> (-0.11%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/network/Manager.d	78.40% <100.00%> (-1.86%)	:arrow_down:
source/agora/network/Client.d	82.44% <0.00%> (-4.59%)	:arrow_down:
source/agora/utils/Utility.d	92.85% <0.00%> (-3.58%)	:arrow_down:
source/agora/node/FullNode.d	73.33% <0.00%> (-1.52%)	:arrow_down:
source/agora/test/Flash.d	95.12% <0.00%> (-0.11%)	:arrow_down:
source/agora/consensus/protocol/Nominator.d	91.51% <0.00%> (ø)
agora/submodules/ocean/src/ocean/text/Ascii.d	0.00% <0.00%> (ø)
...a/submodules/ocean/src/ocean/core/array/Mutation.d	0.00% <0.00%> (ø)
...gora/submodules/ocean/src/ocean/text/convert/Utf.d	0.40% <0.00%> (ø)
... and 43 more

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[omerfirmak]

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