Use progress bars when downloading headers and scanning the blockchain.

[lemmih]

Summary of changes
Changes introduced in this pull request:

• Use progress bars for the three main time-sinks: Importing a snapshot, scanning the imported blockchain, downloading remaining headers from the network.
• Demote libp2p peer reports from INFO to DEBUG.

Reference issue to close (if applicable)

Other information and links

[codecov]

Codecov Report

Merging #1480 (02c1d60) into main (7783ef8) will decrease coverage by 0.01%.
The diff coverage is 7.69%.

@@            Coverage Diff             @@
##             main    #1480      +/-   ##
==========================================
- Coverage   44.19%   44.18%   -0.02%     
==========================================
  Files         322      322              
  Lines       28483    28494      +11     
==========================================
+ Hits        12589    12590       +1     
- Misses      15894    15904      +10     

Impacted Files	Coverage Δ
blockchain/chain/src/store/index.rs	25.00% <0.00%> (-2.87%)	⬇️
blockchain/chain_sync/src/tipset_syncer.rs	0.00% <0.00%> (ø)
node/forest_libp2p/src/service.rs	0.00% <0.00%> (ø)
utils/net_utils/src/download.rs	46.87% <50.00%> (+0.20%)	⬆️

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