Start the prometheus server before loading snapshots.

[lemmih]

Summary of changes
Changes introduced in this pull request:

• Start the prometheus metrics server before loading snapshots. Metrics are useful even before we can connect to the filecoin network.

Reference issue to close (if applicable)

Other information and links

[codecov]

Codecov Report

Merging #1484 (f73fa38) into main (8cfdc9b) will increase coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1484      +/-   ##
==========================================
+ Coverage   44.19%   44.29%   +0.10%     
==========================================
  Files         321      323       +2     
  Lines       28373    28414      +41     
==========================================
+ Hits        12539    12586      +47     
+ Misses      15834    15828       -6     

Impacted Files	Coverage Δ
forest/src/daemon.rs	6.29% <0.00%> (ø)
forest/src/cli/mod.rs	0.00% <0.00%> (ø)
forest/src/subcommand.rs	0.00% <0.00%> (ø)
forest/src/cli/config_cmd.rs	64.28% <0.00%> (ø)
forest/tests/config_tests.rs	100.00% <0.00%> (ø)
blockchain/chain_sync/src/chain_muxer.rs	1.74% <0.00%> (+0.24%)	⬆️
node/utils/src/lib.rs	76.92% <0.00%> (+7.69%)	⬆️
forest/src/cli/config.rs	100.00% <0.00%> (+100.00%)	⬆️
node/forest_libp2p/src/config.rs	100.00% <0.00%> (+100.00%)	⬆️

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