Add sync command to sync out-of-sync local environment

[SarthakJariwala]

Example use cases:

Sync to new specfile

$ ezconda sync --name mlproj --with specfile

sequenceDiagram
    actor Alice (Mac)
    participant Repository
    actor Bob (Windows)
    Note right of Alice (Mac): Create env, spec & lock file using EZconda
    Alice (Mac)->>Repository: Push env, spec & lock file
    Repository->>Bob (Windows): Pull changes
    Note right of Repository: Add new dependency to project
    Note right of Repository: Spec file changed
    Bob (Windows)->>Repository: Push changes made to spec file
    Repository->>Alice (Mac): Pull updated spec file
    Note right of Alice (Mac): Local environment <-Out of Sync-> New spec file
    Note right of Alice (Mac): Use `ezconda sync` to sync

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Sync to new lockfile

$ ezconda sync --name mlproj --with lockfile

sequenceDiagram
    actor Alice (Mac)
    participant Repository
    actor Bob (Mac)
    Note right of Alice (Mac): Create env, spec & lock file using EZconda
    Alice (Mac)->>Repository: Push env, spec & lock file
    Repository->>Bob (Mac): Pull changes
    Note right of Repository: Add new dependency to project
    Note right of Repository: Spec file & Lock file updated to reflect the new addition
    Bob (Mac)->>Repository: Push changes
    Repository->>Alice (Mac): Pull updated lock file
    Note right of Alice (Mac): Local environment <-Out of Sync-> New lock file
    Note right of Alice (Mac): Use `ezconda sync` to sync

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Closes #27

[codecov-commenter]

Codecov Report

Merging #29 (66d8321) into main (24e583a) will increase coverage by 0.42%.
The diff coverage is 95.45%.

❗ Current head 66d8321 differs from pull request most recent head 15ebd7b. Consider uploading reports for the commit 15ebd7b to get more accurate results

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   90.61%   91.03%   +0.42%     
==========================================
  Files          15       16       +1     
  Lines         458      502      +44     
==========================================
+ Hits          415      457      +42     
- Misses         43       45       +2     

Impacted Files	Coverage Δ
ezconda/_utils.py	87.91% <ø> (ø)
ezconda/sync.py	95.23% <95.23%> (ø)
ezconda/main.py	100.00% <100.00%> (ø)

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