find: Implement -fstype

[hanbings]

link: #374

[github-actions]

GNU testsuite comparison:

Run GNU findutils tests: GNU tests summary = TOTAL: 718 / PASS: 433 / FAIL: 282 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0 
Run BFS tests: Changes from main: PASS +2 / SKIP +0 / FAIL -2
Run BFS tests: BFS tests summary = TOTAL: 288 / PASS: 184 / SKIP: 1 / FAIL: 103

[codecov]

Codecov Report

Attention: Patch coverage is 73.58491% with 14 lines in your changes missing coverage. Please review.

Project coverage is 65.31%. Comparing base (fa4cce8) to head (aa2b551).

Files	Patch %	Lines
src/find/matchers/fs.rs	53.84%	8 Missing and 4 partials ⚠️
src/find/matchers/mod.rs	66.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #408      +/-   ##
==========================================
+ Coverage   65.20%   65.31%   +0.11%     
==========================================
  Files          33       34       +1     
  Lines        3888     3941      +53     
  Branches      893      903      +10     
==========================================
+ Hits         2535     2574      +39     
- Misses        993     1001       +8     
- Partials      360      366       +6     

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[github-actions]

GNU testsuite comparison:

Run GNU findutils tests: GNU tests summary = TOTAL: 718 / PASS: 433 / FAIL: 282 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0 
Run BFS tests: Changes from main: PASS +2 / SKIP +0 / FAIL -2
Run BFS tests: BFS tests summary = TOTAL: 288 / PASS: 186 / SKIP: 1 / FAIL: 101

[github-actions]

GNU testsuite comparison:

Run GNU findutils tests: GNU tests summary = TOTAL: 718 / PASS: 433 / FAIL: 282 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0 
Run BFS tests: Changes from main: PASS +2 / SKIP +0 / FAIL -2
Run BFS tests: BFS tests summary = TOTAL: 288 / PASS: 186 / SKIP: 1 / FAIL: 101

[github-actions]

GNU testsuite comparison:

Run BFS tests: Changes from main: PASS +2 / SKIP +0 / FAIL -2
Run BFS tests: BFS tests summary = TOTAL: 288 / PASS: 186 / SKIP: 1 / FAIL: 101
Run GNU findutils tests: RPC failed; HTTP 502 curl 22 The requested URL returned error: 502
Run GNU findutils tests: the remote end hung up unexpectedly
Run GNU findutils tests: GNU tests summary = TOTAL: 706 / PASS: 441 / FAIL: 262 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0