refactor: add runtime manager for bare-metal cluster

[shawnh2]

• implement a new simple runtime manager for bare-metal to manage all the using dirs and paths
• rm the deployer test for bare-metal

all the changes that has been made in this PR, is for the conveniency of later code refactors and migrations.

[zyy17]

@shawnh2 Can we put the metadata management(runtime_manager.go) in pkg/metadata by adding the new API in the Manager interface? I think it's better to keep all the metadata rw in a single instance, it also will make it easy to maintain because all the metadata operations are in one place.

[shawnh2]

@shawnh2 Can we put the metadata management(runtime_manager.go) in pkg/metadata by adding the new API in the Manager interface? I think it's better to keep all the metadata rw in a single instance, it also will make it easy to maintain because all the metadata operations are in one place.

sounds great, let me refactor it!

[shawnh2]

the failed test in https://github.com/GreptimeTeam/gtctl/actions/runs/6573826229/job/17857729564 will also be fixed in this PR

[codecov-commenter]

Codecov Report

Attention: 174 lines in your changes are missing coverage. Please review.

Comparison is base (076389d) 35.80% compared to head (df4655a) 37.67%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #169      +/-   ##
===========================================
+ Coverage    35.80%   37.67%   +1.87%     
===========================================
  Files           12       14       +2     
  Lines         1430     1189     -241     
===========================================
- Hits           512      448      -64     
+ Misses         814      646     -168     
+ Partials       104       95       -9     

Files	Coverage Δ
pkg/cluster/baremetal/validate.go	84.21% <84.21%> (ø)
pkg/cluster/baremetal/not_implemented.go	0.00% <0.00%> (ø)
pkg/metadata/manager.go	74.15% <67.27%> (-11.14%)	⬇️
pkg/cluster/baremetal/config.go	0.00% <0.00%> (ø)
pkg/cluster/baremetal/cluster.go	0.00% <0.00%> (ø)
pkg/cluster/baremetal/get.go	12.74% <12.74%> (ø)

... and 2 files with indirect coverage changes

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[zyy17]

LGTM